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slope 4

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Senior Manager
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slope 4 [#permalink] New post 14 Jul 2009, 14:12
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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
What are the coordinates of a point between points A and B on the line segment AB, if point A is (7,5) and point B is (15,9)?
[Reveal] Spoiler:
(9,6)(11,7) or (13,8)


please explain.
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Re: slope 4 [#permalink] New post 14 Jul 2009, 14:33
Use 2 equations to figure out y=mx+b

A: 5=7m+b
B: 9=15m+b

Subtract:
-4=-8m
m=1/2

Now equation is: y=1/2x+b
Plug in point A:
5=1/2(7)+b
b=1.5

So equation is: y=0.5x+1.5

Plug in any number for x between 7 and 15 and you will get the corresponding y value.
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Re: slope 4 [#permalink] New post 15 Jul 2009, 18:54
Thanks for the reply..
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Re: slope 4   [#permalink] 15 Jul 2009, 18:54
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