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f(-4) = a(-4) + b
-14 = -4a + b ... (i)
f(2) = a(2) + b
4 = 2a + b ... (ii)
(-4a + b) - (2a + b) = -14 - 44
-6a = -18
a = 3
4 = 2(3) + b
4 = 6 + b ---> b = 4 - 6 = -2
jadi f(x) = ax + b = 3x - 2