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f(3) = 3a + b = 23
f(-2) = -2a + b = -27
---------------------------(-)
5a = 50
a = 50/5
a = 10
substitusi
3a+b = 23
3(10) + b = 23
b = 23 - 30
b = -7
maka nilai a = 10 dan b = -7