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f(x) = ax + b
f(10) = 8 ⇒ 10a + b = 8 ...(1)
f(5) = 3 ⇒ 5a + b = 3 ...(2)
eliminasi:
10a + b = 8
5a + b = 3
_________ -
5a = 5
a = 1
b = -2
f(x) = x - 2
maka f(4) = 4 - 2 = 2