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3a + b = 8 -2a + b = -7
pakek cara eliminasi.
a = 3
b= -1
f(3)=3a+b
8=3a+b
f(-2)=-2a+b
-7=-2a+b
3a+b=8
-2a+b=-7
5a=15
a=3
3a+b=8
3.3+b=8
b=8-9=-1