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f(x) = ax + b
f(3) = 3a + b = 15
f(-2) = -2a + b = 10
5a = 5
a = 1
3a + b = 15
3(1) + b = 15
b = 12
Jawaban 2
f(x) = 1(x) + 12 atau f(x) = x + 12
Jawaban 3
f(7) = 1(7) + 12
= 7 + 12
= 19