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# slope 4

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Manager
Joined: 16 Apr 2009
Posts: 233
Schools: Ross

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14 Jul 2009, 14:12
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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)

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Senior Manager
Joined: 25 Mar 2009
Posts: 301

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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.
Manager
Joined: 16 Apr 2009
Posts: 233
Schools: Ross

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15 Jul 2009, 18:54
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Keep trying no matter how hard it seems, it will get easier.

Re: slope 4   [#permalink] 15 Jul 2009, 18:54
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