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the y-intercept of l (GMAT PREP 1)

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by alex.gellatly » Fri Aug 03, 2012 11:14 pm
In the xy-plane, what is the y-intercept of line l?
(See attachment)

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A useful website I found that has every quant OG video explanation:

https://www.beatthegmat.com/useful-websi ... tml#475231
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Source: — Data Sufficiency |

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by Anurag@Gurome » Sat Aug 04, 2012 3:14 am
Equation of a line in point intercept form is y = mx + b, where m is the slope of the line,
b is the y-intercept of the line.

The question is to find the value of b.

(1) The slope of line l is 3 times its y-intercept implies m = 3b, which is not enough to find b; Not SUFFICIENT.

(2) The x-intercept of line l is -1/3.
x-intercept is the value of x when y = 0
0 = (-1/3)m + b
m = 3b, which is the same as statement 1; Not SUFFICIENT.

Combining (1) and (2), gives no new information; NOT sufficient.

The correct answer is E.
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