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A line is graphed on a coordinate plane. How many times less is the di

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A line is graphed on a coordinate plane. How many times less is the distance between the y-intercept and the x-axis than the distance between the x-intercept and the y-axis?

(1) The slope of the line is −9/13.

(2) The y-intercept is located at (0, 26).

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[Reveal] Spoiler: OA

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Re: A line is graphed on a coordinate plane. How many times less is the di [#permalink]

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New post 10 Feb 2015, 06:22
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To solve this problem we need the x and y intercepts. We can find these intercepts with the \(y = mx + b\) equation of the line.
So if we can find the line's slope (m) and the y-intercept (b), we will have sufficient information.
Each of the two statements gives us one piece of the equation, so we need to take them together. The correct answer is C.

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New post 10 Feb 2015, 08:01
sterling19 wrote:
To solve this problem we need the x and y intercepts. We can find these intercepts with the \(y = mx + b\) equation of the line.
So if we can find the line's slope (m) and the y-intercept (b), we will have sufficient information.
Each of the two statements gives us one piece of the equation, so we need to take them together. The correct answer is C.


hi sterling,
i think you have answered generally all question correctly but this may be wrong although approach has been correct..
i think ans should be A.. tht is slope itself is sufficient in this case..
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New post 10 Feb 2015, 08:11
ans A..
the question gives following info..
Let the y intercept be (0,y) and x intercept, (x,0)...
distance between the y intercept and x axis is y-0=y..
distance between the x intercept and y axis is x-0=x..

now the question asks us.." How many times less is the distance between the y-intercept and the x-axis than the distance between the x-intercept and the y-axis?".
It basically means (x-y)/x = 1-y/x or ( 1- slope )..
now lets take the statements..
1) statement one gives us slope... sufficient as we required slope itself
2) statement two tells us about y intercept... x intercept required.. insufficient

ans A
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Re: A line is graphed on a coordinate plane. How many times less is the di [#permalink]

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New post 10 Feb 2015, 08:29
Here we go :

Basically, the question is asking the relationship between the x-intercept and y-intercep.

So let the equation of the line be -> y = mx +c ----(1)

St1: The slope of the line is −9/13.

m = -9/13 ->Substitute in (1)

So y = -9/13 * (x) + c

To find y-intercept, put x = 0

y = c ---(2)

To find x-intercept, put y = 0

0 = -9/13 * (x) + c

x = 13/9 * c

From (2)

x = 13/9 * y

Hence St1 is sufficient.

St2: The y-intercept is located at (0, 26).

From (1)
y = 26

and

x = -26 / m

Clearly insufficient

Option A is correct

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Re: A line is graphed on a coordinate plane. How many times less is the di [#permalink]

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New post 10 Feb 2015, 12:48
Quote:
A line is graphed on a coordinate plane. How many times less is the distance between the y-intercept and the x-axis than the distance between the x-intercept and the y-axis?

(1) The slope of the line is −9/13.

(2) The y-intercept is located at (0, 26).

since we need to know HOW MANY TIMES LESS is the distance, we do not need to find a value for the distance, but for a number which multiplies the y intercept distance from the x-ax.

(2) does not provide us with the x intercept. insuff
(1) does provide us with the slope. if, for example the y intercept is 9, we know that the x intercept is at x=13. if the y intercept is 4,5, we know that the x intercept is at 6,5. its the sample multiple. since all parallels of THIS exact line contain the same multiple, the parallel going through 0 also has the same multiple.

so A is suff

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Bunuel wrote:
A line is graphed on a coordinate plane. How many times less is the distance between the y-intercept and the x-axis than the distance between the x-intercept and the y-axis?

(1) The slope of the line is −9/13.

(2) The y-intercept is located at (0, 26).

Kudos for a correct solution.


VERITAS PREP OFFICIAL SOLUTION

C. This problem is a classic "Why Are You Here?" data sufficiency problem related to Statement 2. The slope of a line (with one exception) will provide the ratio of x-intercept to y-intercept. Say that the line were in the form y = (-9/13)x + 9. The y-intercept would be 9, and the x-intercept would be 13; if you double the y-intercept just to see the ratio pattern, you'd see that the ratio stays exactly the same: y = (-9/13)x + 18 would leave a y-intercept of 18 and an x-intercept of 26, again for a ratio of y-int : x-int of 9:13.

But here is why you need to consider what statement 2 is telling you - it's clearly not sufficient on its own, but what it does tell you is that the line does not pass through the origin (0,0). If it were to pass through the origin, the ratio of intercepts would be 0:0, since the intercept points would be at exactly that (0, 0) point. That's the only point on the coordinate plane for which the ratio of x-intercept to y-intercept is not defined by the slope.
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Bunuel wrote:
Bunuel wrote:


..... The slope of a line (with one exception) will provide the ratio of x-intercept to y-intercept....

... If it were to pass through the origin, the ratio of intercepts would be 0:0



Can somebody clarify the two statements above?

Firstly there is no a ratio 0:0 in the world of Maths because 0/0 cannot be defined. So something else means by 0:0.

Also for the first statement lets say that we have the line y = 2x + 10

x inter. will be derived by 2x = -10 then x = -5
y inter. will be derived by y = 10

then the ratio x:y = -5/10 = - 1/2 which is not equal to 2:1

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Re: A line is graphed on a coordinate plane. How many times less is the di [#permalink]

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New post 27 Sep 2017, 05:50
chetan2u wrote:
ans A..
the question gives following info..
Let the y intercept be (0,y) and x intercept, (x,0)...
distance between the y intercept and x axis is y-0=y..
distance between the x intercept and y axis is x-0=x..

now the question asks us.." How many times less is the distance between the y-intercept and the x-axis than the distance between the x-intercept and the y-axis?".
It basically means (x-y)/x = 1-y/x or ( 1- slope )..
now lets take the statements..
1) statement one gives us slope... sufficient as we required slope itself
2) statement two tells us about y intercept... x intercept required.. insufficient

ans A


I am confused about the OA. Can an expert have a look at this question? I also thought the answer to be A? Thanks.

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New post 27 Sep 2017, 05:55
deucebigalow wrote:
chetan2u wrote:
ans A..
the question gives following info..
Let the y intercept be (0,y) and x intercept, (x,0)...
distance between the y intercept and x axis is y-0=y..
distance between the x intercept and y axis is x-0=x..

now the question asks us.." How many times less is the distance between the y-intercept and the x-axis than the distance between the x-intercept and the y-axis?".
It basically means (x-y)/x = 1-y/x or ( 1- slope )..
now lets take the statements..
1) statement one gives us slope... sufficient as we required slope itself
2) statement two tells us about y intercept... x intercept required.. insufficient

ans A


I am confused about the OA. Can an expert have a look at this question? I also thought the answer to be A? Thanks.


Check here: https://gmatclub.com/forum/a-line-is-gr ... l#p1485415
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: A line is graphed on a coordinate plane. How many times less is the di   [#permalink] 27 Sep 2017, 05:55
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