Respostas

2014-04-14T13:02:36-03:00
9=-3a+b
-7=5a+b (-1)
9=-3a+b
7=-5a-b
9=-3a
7=-5a
16=-8a
16/-8=a
a=-2
9=-3.-2+b
9=6+b
-6+9=b
b=3
f(x)=-2x+3
f(1)=-2.1+3
f(1)=-2+3
f(1)=1
-2x+3=0
3=2x
x=3/2


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