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y intercept

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y intercept

by shibal » Thu Jul 02, 2009 4:56 pm
In xy plane, what is y-intercept of l?
a. Slope of l is 3 times the y intercept
b. x-intercept of l is -⅓

oa e
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Source: — Data Sufficiency |
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by Robinmrtha » Thu Jul 02, 2009 8:00 pm
the equation be
y = mx + c
where
m = slope
c = y intercept

Statement 1
m=3c
substitute in the eqn
y =3cx + c
we cant solve for c
insufficient

Statement 2
x intercept is -1/3
To find x intercept
put y = 0 in the equation
0= mx + c
c = - mx
put the value of x
c= - m * -1/3
=1/3m
still we dont know the value of m
so insufficient

using both
c = 1/3 m from statement 2
and m = 3c
we cant solve for c
so insufficient
Answer is E
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by benissleeping » Fri Jul 03, 2009 12:19 am
Yes E, both statements are in effect the same equation.

(1) y=mx+c when x=0 y=c m=3c

y=3cx+c NS

(2)

0=-1/3m+c
m=3c NS

Both statements are m=3c

So E
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