In the xy-plane, what is the y-intercept of line L?
(1) The slope of line L is 3 times its y-intercept?
(2) The x-intercept of line L is (-1/3)
OA E
Gmat Prep Geom - Reposting
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- jackcrystal
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slope m = -(b/a) where b = y intercept and a = x intercept
I. slope is 3 times y-intercept,
3b = -b/a
a = -1/3 (basically it gives us x intercept value). can't find y-intercept with this value.
No Suff
II. x intercept = -1/3
we found this value before in I. this can't be used to find y intercept
Not Suff
I + II
3b = -b(-1/3)
=> 3b = 3b (Dahhh)
Therefore, (E)
I. slope is 3 times y-intercept,
3b = -b/a
a = -1/3 (basically it gives us x intercept value). can't find y-intercept with this value.
No Suff
II. x intercept = -1/3
we found this value before in I. this can't be used to find y intercept
Not Suff
I + II
3b = -b(-1/3)
=> 3b = 3b (Dahhh)
Therefore, (E)