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# Which of the following passes through points (-5, 8) (3,

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Manager
Joined: 14 Mar 2007
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Which of the following passes through points (-5, 8) (3, [#permalink]

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25 Jun 2007, 07:37
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Which of the following passes through points (-5, 8) (3, -16) ?

(A) y = -x -7
(B) y = -2x -7
(C) y = -3x -7
(D) y = 3x -7
(E) y = +3x +7
Senior Manager
Joined: 28 Feb 2007
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25 Jun 2007, 07:48
C.
U can solve it by 2 methods:

1-method) put both points to given functions and check if it is true. C it is.

2-method)
slope= (y1-y2)/(x1-x2)=-3

-3=(y-y1)/(x-x1) then -3=(y-8)/(x-(-5))
-3*(x+5)=y-8 SO Y=-3X-7
Manager
Joined: 03 Mar 2007
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25 Jun 2007, 11:30
andrehaui wrote:
Which of the following passes through points (-5, 8) (3, -16) ?

(A) y = -x -7
(B) y = -2x -7
(C) y = -3x -7
(D) y = 3x -7
(E) y = +3x +7

C also.

Slope = (-16 - 8)/(3 + 5) = -24/8 = -3

C is the only solution with -3 slope.
Senior Manager
Joined: 21 Jun 2006
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25 Jun 2007, 19:40
C
As pointed out multiple methods can be used, but the easiest method is:
to
find slope of the line -
y-y1=m(x-x1)
Plug in the numbers to get m=-3

Only C satisfies the slope as -3
Manager
Joined: 14 Mar 2007
Posts: 235
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Kudos [?]: 8 [0], given: 0

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26 Jun 2007, 06:22
got it all-----------CCCCCCC is the one
26 Jun 2007, 06:22
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