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23 Jun 2008, 12:41
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In the xy-plan, what is the y-intercept of line 1?
a. the slope of the line 1 is 3 times its y-intercept
b. the x-intercept of line 1 is -1/3
y = mx + c
m = 3c
x = 0
y = c --- y is equal to its intercept - insufficient
b.
y = 1m/3 + c
y = m+ 3c - insufficient
both statement together
c = m + 3c
-2c = m
c = -m/2 .
I'm guessing the answer is E.
Please provide some explaination. Thanks
a. the slope of the line 1 is 3 times its y-intercept
b. the x-intercept of line 1 is -1/3
y = mx + c
m = 3c
x = 0
y = c --- y is equal to its intercept - insufficient
b.
y = 1m/3 + c
y = m+ 3c - insufficient
both statement together
c = m + 3c
-2c = m
c = -m/2 .
I'm guessing the answer is E.
Please provide some explaination. Thanks
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23 Jun 2008, 12:51
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Ali..i would suggest you draw the line..i think its the best approach..
OK..so we know y=-1/3X + C..
we are told C=3*-1/3=-1
C should be it
OK..so we know y=-1/3X + C..
we are told C=3*-1/3=-1
C should be it
23 Jun 2008, 12:54
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I think the answer is E.
1) We only know the slope, and even then, it's a ratio of slope to y-intercept. Insufficient.
2) We are told the x-intercept. Nothing about the slope or y-intercept. This is insuffiicient.
Together). We know the x intercept and the slope in terms of y-intercept. We don't know an absolute slope of the line so even if we start at the x-intercept, we don't know which way to go because we have an infinite number of options. Insufficient together.
1) We only know the slope, and even then, it's a ratio of slope to y-intercept. Insufficient.
2) We are told the x-intercept. Nothing about the slope or y-intercept. This is insuffiicient.
Together). We know the x intercept and the slope in terms of y-intercept. We don't know an absolute slope of the line so even if we start at the x-intercept, we don't know which way to go because we have an infinite number of options. Insufficient together.
alimad
