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y=4,5-x
2x+3(4,5-x)=12
2x+13,5-3x=12
-x=-1,5
x=1,5
y=4,5-1,5=3
b)
y=x-9
x+2(x-9)=-15
x+2x-18=-15
3x=3
x=1
y=1-9=-8
c)
y=x+1
2x+3(x+1)=13
2x+3x+3=13
5x=10
x=2
y=2+1=3