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f(3) = 15
3a + b = 15
f(5) = 20
5a + b = 20
eliminasikan
5a + b = 20
3a + b = 15 -
2a = 5
a = 2,5
3a + b = 15
3(2,5) + b = 15
7,5 + b = 15
b = 7,5
maka a = 2,5 dan b = 7,5
maka f(x) = ax + b = 2,5(x) + 7,5
maka f(-2) = 2,5(-2) + 7,5 = -5 + 7,5 = 2,5