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f(2) = 3 maka 2a + b = 3
f(-3) = 13 maka -3a + b = 13
eliminasi:
2a + b = 3
-3a + b = 13
__________ -
5a = - 10
a = - 2
b = 7
f(x) = - 2x + 7
f(-42) = - 2(-42) + 7 = 91