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a. f(3) = 3a + b = 15
f(-2) = -2a + b = 10 - (Eliminasi)
5a = 5
a = 1
3a + b = 15
3 + b = 15
b = 15 - 3
= 12
nilai a = 1 b = 12
b. f(x) = ax+ b
f(x) = (1)x + 12
= x + 12
c.f(x) = x+12
f(7) = 7+12
= 19