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f(5) = 5a+b = 11
5(-1-b)+b = 11
-5-5b+b = 11
-4b = 11+5
b = 16/-4
b = -4
substitusi nilai b -----> a= -1-(-4)= 3
bentuk fungsi f(x) = 3x-4
f(3) = 3(3)-4=5