Answers

2014-10-12T18:33:01+08:00
Ax+By=C
> y=-x+9
x+y=9
> y=5x-4
(-5x+y=-4)-
5x-y=4

y=mx+b
>x+y=5
y=-x+5
>2x+y=-4
y=-2x-4

:)


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