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f(3) => 3a + b= 1
f(1) => a + b = -1
a = -1 - b
subsitusikan
3a + b = 1
3(-1 - b) + b= 1
-3 - 3b + b=1
-2b = 1+3
b = 4/-2
b= -2
subsitusikan
a+b=-1
a + -2 = 1
a = 2+1
a=3