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f(5) --> 5a + b = -32 ..(2)
eliminasi persamaan (1) dan (2)
-2a + b = 17
5a + b = -32
------------------ -
-7a = 49
a = -7
substitusi ke persamaan (1)
-2(-7) + b = 17
14 + b = 17
b = 3
f(12) = -7(12) + 3
= -84 + 3
= -81