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f(-3) = -15
f(3) = 9
jawab:
f(-3) = a(-3) + b =15
f(-3) = -3a +b =15
f(3) = a(3) + b = 9
f(3) = 3a +b = 9
(-3a + b = 15) - (3a + b = 9) = -6a = 6
a = 6/ (-6) = -1
f(3) = 3a + b = 9
= 3(-1) + b = 9
= -3 + b = 9
b = 9+3 = 12