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a)
3a+b=0
2a+b=-3
------------- _
a=3
3*3+b=0
b=-9
f(x)=3x-9
b)
b=4
a+b=0
a=-4
f(x)=-4x+4
c)
2a+b=0
a+b=-1
--------- _
a=1
b=-2
f(x)=x-2
d)
a+b=4
-1/3a+b=0
------------- _
4/3a=4
a=4*3/4
a=3
b=1
f(x)=3x+1