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Gmat Prep - Slope

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Gmat Prep - Slope

by dubeystuts » Sat Jan 31, 2009 4:35 am
The y-intercept of a line l is 4. If the slope of l is negative, which of the following could be the x-intercept of l?

1) -1
2) 0
3) 6

A) I only
B) II only
C) III Only
D) I and II
E) I and III

Right answer is C.
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by ontopofit » Sat Jan 31, 2009 4:53 am
yes its C.

slope of the line is y=-mx +4

from the equation for y=0;x can only have +ve value except 0.

henve C.
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by maihuna » Sat Jan 31, 2009 11:15 am
y = mx+c

x=0, -4=c

y=0, 0 = mx - 4
and m<0 so -(mx + 4) = 0
so x = -4/m

It will be always negative
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