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kzaveri17
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Lines r and s lie in the xy-plane. Is the y-intercept of lin Updated on: 08 Dec 2015, 03:38
Originally posted by kzaveri17 on 07 Jun 2013, 03:35.
Last edited by chetan2u on 08 Dec 2015, 03:38, edited 2 times in total.
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

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60% (01:57) correct 40% (01:39) wrong based on 305 sessions

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Lines r and s lie in the xy-plane. Is the y-intercept of line r less than the y-intercept of line s ?

(1) At the intersection point of r and s, the x-coordinate and y-coordinate are both negative.
(2) The slope of line r is greater than the slope of line s.

Source Jeff Sackmann

Please explain. Also, please explain how this would work if the were question were asking about the x-intercepts of lines 'r' and 's'
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C
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Bunuel
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 08 Jun 2013, 03:28
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kzaveri17
Lines r and s lie in the xy-plane. Is the y-intercept of line r less than the y-intercept of line s ?

(1) At the intersection point of r and s, the x-coordinate and y-coordinate are both negative.
(2) The slope of line r is greater than the slope of line s.

Source Jeff Sackmann

Please explain. Also, please explain how this would work if the were question were asking about the x-intercepts of lines 'r' and 's'
Show more

Similar questions to practice:
slopes-of-m-and-n-124025.html
point-r-s-lies-on-the-line-l-is-the-line-s-intercept-with-94505.html
in-the-xy-plane-both-line-k-and-l-intersect-with-axis-y-is-94508.html
line-m-and-n-pass-through-point-1-2-is-the-slope-of-m-90629.html
if-lines-k-and-j-are-in-the-xy-coordinate-plane-is-the-84532.html
in-the-xy-plane-is-the-slope-of-line-l-greater-than-the-126941.html
lines-n-and-p-lie-in-the-xy-plane-is-the-slope-of-the-line-30553.html
line-l1-has-a-slope-a-and-line-l2-has-the-slope-b-is-a-b-140953.html
if-the-slopes-of-the-line-l1-and-l2-are-of-the-same-sign-is-126759.html
lines-n-and-p-lie-in-the-xy-plane-is-the-slope-of-line-n-127999.html

Hope it helps.
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 07 Jun 2013, 15:12
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See attached images.

Ans C
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Individual.JPG [ 70.41 KiB | Viewed 9277 times ]

St1 ST2 Together.JPG
St1 ST2 Together.JPG [ 30.08 KiB | Viewed 9275 times ]

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Lines r and s lie in the xy-plane. Is the y-intercept of lin 07 Jun 2013, 15:32
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If we were to consider the same question for x-coordinates, I think the answer would be E.
See image attached.
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 08 Jun 2013, 01:04
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Thank you so much. Figuring that out for Y-axis was not much of a problem, however, not so for the x-axis. Thank for for the second opinion.

Warm regards
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 15 Feb 2014, 05:30
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Bunuel
kzaveri17
Lines r and s lie in the xy-plane. Is the y-intercept of line r less than the y-intercept of line s ?

(1) At the intersection point of r and s, the x-coordinate and y-coordinate are both negative.
(2) The slope of line r is greater than the slope of line s.

Source Jeff Sackmann

Please explain. Also, please explain how this would work if the were question were asking about the x-intercepts of lines 'r' and 's'

Similar questions to practice:
slopes-of-m-and-n-124025.html
point-r-s-lies-on-the-line-l-is-the-line-s-intercept-with-94505.html
in-the-xy-plane-both-line-k-and-l-intersect-with-axis-y-is-94508.html
line-m-and-n-pass-through-point-1-2-is-the-slope-of-m-90629.html
if-lines-k-and-j-are-in-the-xy-coordinate-plane-is-the-84532.html
in-the-xy-plane-is-the-slope-of-line-l-greater-than-the-126941.html
lines-n-and-p-lie-in-the-xy-plane-is-the-slope-of-the-line-30553.html
line-l1-has-a-slope-a-and-line-l2-has-the-slope-b-is-a-b-140953.html
if-the-slopes-of-the-line-l1-and-l2-are-of-the-same-sign-is-126759.html
lines-n-and-p-lie-in-the-xy-plane-is-the-slope-of-line-n-127999.html

Hope it helps.
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Hi Bunuel, is it worth giving algebraic approach a try here? Or how does one deal with the statement mentioning that they meet on the third quadrant?

Thanks!
Cheers
J
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 06 Jun 2014, 00:49
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kzaveri17
Lines r and s lie in the xy-plane. Is the y-intercept of line r less than the y-intercept of line s ?

(1) At the intersection point of r and s, the x-coordinate and y-coordinate are both negative.
(2) The slope of line r is greater than the slope of line s.

Source Jeff Sackmann

Please explain. Also, please explain how this would work if the were question were asking about the x-intercepts of lines 'r' and 's'
Show more

The line s: y = ax + b, b is the y-intercept of s
The line r: y = cx + d, d is the y-intercept of r

The question "Is the y-intercept of line r less than the y-intercept of line s?" can interpret as: Is d < b?

1. The intersection point of r and s will have the same x-coordinate and y-coordinate: ax + b = cx + d => \(x=\) \(\frac{(d-b)}{(a-c)}\)Since this intersection point has negative x-intercept: \(\frac{(d-b)}{(a-c)}\) \(<0\)
There are 2 scenario:
(a) d-b<0 and a-c>0 => d<b
or
(b) d-b>0 and a-c<0 => d>b
=> (1) is not sufficient
2. c>a or a - c <0: not sufficient

(1) + (2):
a - c < 0 and [d-b][/a-c]<0
=> d - b > 0 => d > b: Sufficient. The answer is C
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 11 Oct 2016, 08:31
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kzaveri17
Lines r and s lie in the xy-plane. Is the y-intercept of line r less than the y-intercept of line s ?

(1) At the intersection point of r and s, the x-coordinate and y-coordinate are both negative.
(2) The slope of line r is greater than the slope of line s.

Source Jeff Sackmann

Please explain. Also, please explain how this would work if the were question were asking about the x-intercepts of lines 'r' and 's'
Show more
Bunuel /experts

is my algebraic approach correct??
Combining both statements
let intersection coordinates be(-x,-y)
then equation for
line r----> -y=m1(-x)+b
line s------> -y=m2(-x)+c

slope r------>m1=b/x
slope s------->m2=c/x

as per option (2)---------> b/x>c/x------> b>c.........sufficient

thanks
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 11 Oct 2016, 11:22
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abhimahna
Hey Mike,

I am a Magoosh student. I need your help on the below question. Could you please help me get into the final solution. I marked C as the answer but the different responces of the people have confused me.

Please provide your views.

Lines r and s lie in the xy-plane. Is the y-intercept of line r less than the y-intercept of line s ?

(1) At the intersection point of r and s, the x-coordinate and y-coordinate are both negative.
(2) The slope of line r is greater than the slope of line s
Show more
Dear abhimahna,

I'm happy to respond. The answer is (C).

Your question is extremely unclear. Are you confused about what this OA is? Or would you like further explanation about some of the reasoning that other people have used? If the latter is the case, please let me know exactly what points confuse you. I recommend this blog:
Asking Excellent Questions
If you have further questions about this, make it your goal to ask a question of the highest possible quality.

Does all this make sense?
Mike :-)
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 11 Oct 2016, 11:30
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abhimahna
Hey Mike,

I am a Magoosh student. I need your help on the below question. Could you please help me get into the final solution. I marked C as the answer but the different responces of the people have confused me.

Please provide your views.

Lines r and s lie in the xy-plane. Is the y-intercept of line r less than the y-intercept of line s ?

(1) At the intersection point of r and s, the x-coordinate and y-coordinate are both negative.
(2) The slope of line r is greater than the slope of line s
Dear abhimahna,

I'm happy to respond. The answer is (C).

Your question is extremely unclear. Are you confused about what this OA is? Or would you like further explanation about some of the reasoning that other people have used? If the latter is the case, please let me know exactly what points confuse you. I recommend this blog:
Asking Excellent Questions
If you have further questions about this, make it your goal to ask a question of the highest possible quality.

Does all this make sense?
Mike :-)
Show more
Hi mike

I too have a confusion regarding the same..

both attached fig have slope R> slope S
but intercept of r > s in first but intercept of R , s in 2nd one

Thanks
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 11 Oct 2016, 11:36
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rohit8865
kzaveri17
Lines r and s lie in the xy-plane. Is the y-intercept of line r less than the y-intercept of line s ?

(1) At the intersection point of r and s, the x-coordinate and y-coordinate are both negative.
(2) The slope of line r is greater than the slope of line s.

Source Jeff Sackmann

Please explain. Also, please explain how this would work if the were question were asking about the x-intercepts of lines 'r' and 's'
Bunuel /experts

is my algebraic approach correct??
Combining both statements
let intersection coordinates be(-x,-y)
then equation for
line r----> -y=m1(-x)+b
line s------> -y=m2(-x)+c

slope r------>m1=b/x
slope s------->m2=c/x

as per option (2)---------> b/x>c/x------> b>c.........sufficient

thanks
Show more
Dear rohit8865,
My friend, I would say that yours is an exceptionally elegant solution. Good work!
Mike :-)
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 11 Oct 2016, 11:51
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rohit8865

Hi mike

I too have a confusion regarding the same..

both attached fig have slope R> slope S
but intercept of r > s in first but intercept of R , s in 2nd one

Thanks
Show more
Dear rohit8865,

I'm happy to respond. :-)

My friend, in math, we have to treat even the words with mathematical precision. Consider statement #2:
The slope of line r is greater than the slope of line s.
Exactly what does this say? Slope is a number, a number on the number line.

Suppose line r has a slope of -0.1, and line s had a slope of -50. If looked at a picture, line r would look almost horizontal, with a very slight downward grade, but line s would have a massively steep slope down to the the right. Which has a bigger slope?

Well, (-50) < (-0.1). The question is asking for the literal order of the two numbers on the number line, and -0.1 is to the right of -50 on the number line. Therefore, m = -0.1 is a bigger slope than m = -50, even though the latter is steeper. Steeper in a negative direction is a lower slope, exactly as bigger in the negative direction is a smaller number.

Does all this make sense?
Mike :-)
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 11 Oct 2016, 12:15
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rohit8865

Hi mike

I too have a confusion regarding the same..

both attached fig have slope R> slope S
but intercept of r > s in first but intercept of R , s in 2nd one

Thanks
Dear rohit8865,

I'm happy to respond. :-)

My friend, in math, we have to treat even the words with mathematical precision. Consider statement #2:
The slope of line r is greater than the slope of line s.
Exactly what does this say? Slope is a number, a number on the number line.

Suppose line r has a slope of -0.1, and line s had a slope of -50. If looked at a picture, line r would look almost horizontal, with a very slight downward grade, but line s would have a massively steep slope down to the the right. Which has a bigger slope?

Well, (-50) < (-0.1). The question is asking for the literal order of the two numbers on the number line, and -0.1 is to the right of -50 on the number line. Therefore, m = -0.1 is a bigger slope than m = -50, even though the latter is steeper. Steeper in a negative direction is a lower slope, exactly as bigger in the negative direction is a smaller number.

Does all this make sense?
Mike :-)
Show more

thanks mike
for ur reply....+1
this is exactly what i also thought after solving algebraically as in above post
Just wanna confirm from experts...

Thanks
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Lines r and s lie in the xy-plane. Is the y-intercept of lin 12 Oct 2016, 04:55
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rohit8865
kzaveri17
Lines r and s lie in the xy-plane. Is the y-intercept of line r less than the y-intercept of line s ?

(1) At the intersection point of r and s, the x-coordinate and y-coordinate are both negative.
(2) The slope of line r is greater than the slope of line s.

Source Jeff Sackmann

Please explain. Also, please explain how this would work if the were question were asking about the x-intercepts of lines 'r' and 's'
Bunuel /experts

is my algebraic approach correct??
Combining both statements
let intersection coordinates be(-x,-y)
then equation for
line r----> -y=m1(-x)+b
line s------> -y=m2(-x)+c

slope r------>m1=b/x
slope s------->m2=c/x

as per option (2)---------> b/x>c/x------> b>c.........sufficient

thanks
Show more

Responding to a pm:

I don't get how you calculated slopes as b/x and c/x.

If I have not misunderstood your variables, it should be:

r passes through (-x, -y) and (0, b) (since y intercept is b)
s passes through (-x, -y) and (0, c)

Slope = (y2 - y1)/(x2-x1)

Slope for r = (b + y)/(0 + x) = (b+y)/x
Slope for s = (c + y)/(0 + x) = (c+y)/x

Though in the case too,
(b+y)/x > (c+y)/x

Multiply both sides by x which is positive.

b + y > c + y

b > c
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Dear Mike/ experts,

Considering stm 1 and 2 together: what if R is parallel to Y axis, hence its slope is infinity and it has no Y intercept. S can be any line with positive Y intercept. We can have a scenario where both these lines intersect such that both its coordinates are negative (stm 1) and considering that infinity is more than the slope of line S (say having positive slope of 50) , it also adheres to stm 2. But here intercept of R (nil) is not more than intercept of S (some positive value).
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Alchemist87
Dear Mike/ experts,

Considering stm 1 and 2 together: what if R is parallel to Y axis, hence its slope is infinity and it has no Y intercept. S can be any line with positive Y intercept. We can have a scenario where both these lines intersect such that both its coordinates are negative (stm 1) and considering that infinity is more than the slope of line S (say having positive slope of 50) , it also adheres to stm 2. But here intercept of R (nil) is not more than intercept of S (some positive value).
Show more
Dear Alchemist87,

I'm happy to respond. :-)

First, I will say that this is a very creative and out-of-the-box observation. This creativity will serve you well in your career.

In this particular problem, though, I think that case is eliminated by the question. Here's the text of the question again:
Lines r and s lie in the xy-plane. Is the y-intercept of line r less than the y-intercept of line s ?

(1) At the intersection point of r and s, the x-coordinate and y-coordinate are both negative.
(2) The slope of line r is greater than the slope of line s.

If the question is asking whether one quantity is less than another quantity. It would be devious and tricky in a way that the GMAT simply does not do if one of the quantities about which it was asking in that context simply did not exist. The fact that the GMAT asks about the two y-intercepts really implies, among other things, that they both exist.

Now, a vertical line R might be consistent with Statement #1 by itself, by this statement by itself is not sufficient anyway.

Once we get to statement #2, we get another prohibition: although stated verbally, the statement (slope R) < (slope S) is a well-defined mathematical statement. We can only make well-defined mathematical statements with numbers that exist on the number line. Metaphorically, we can say that infinity is "bigger" than any given number, but we can't actually state that fact as a well-defined mathematical statement. (There are many different kinds of infinity, but that's mathematics that is well beyond the GMAT!) In practice, any value that becomes infinite, such as 1/0, is called "undefined," precisely because it departs from the region for which we can make well-defined statements.

Therefore, both the prompt and statement #2 make a vertical line impossible in this problem.

I want to emphasize, though, what you asked was truly a brilliant question, my friend. Let me know if you have any more questions.

Mike :-)
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Thxs Mike.. for taking time to revert to my query & for those kind words- just made my day!! :-D
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Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Bunuel
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