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How do you do this? Math problem

 
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Slappy101
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PostPosted: Thu Jan 29, 2009 1:09 am    Post subject: How do you do this? Math problem Reply with quote

How do I get an xa+yb=c formula into a y=mx+b form?

I have to find the point of intercept without using a graph for these problems and every single one I've been doing with the xa+yb=c formula has been wrong -_-

This is what I did for one of them and I got it right, but one of the forumulas was xa+yb=c, the other was y=mx+b

3x-4y=-5
y=x-2

3x-4(x-2)=-5
3x-4x+8=-5
-x+8 = -5
-x=-13
x=13

y=13-2
y=11

So the point of intercept is (13,11) which is right according to the answer sheet, but every time I get one like this, I get it wrong.

2x+5y=62
3x-y=23.3

How can I find the point of intercept with these two?

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