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f(-2) = -5 --> -2a + b = -5
f(3) = 15 --> 3a + b = 15 _
-5a = -20
a = 4
3a + b = 15
3(4) + b = 15
b = 15 - 12
b = 3
f(x) = 4x + 3
f(8) = 4(8) + 3
= 32 + 3
= 35
semoga membantu :)
f(-2) = -2a + b
-5 = -2a + b............(1)
f(3) = 3a + b
15 = 3a + b............(2)
-5 = -2a + b
15 = 3a + b
_____________-
-20 = -5a
4 = a
15 = 3a + b
15 = 3(4) + b
b = 15 -12
b = 3
f(8) = 8a + b
= 8(4) + 3
= 32 + 3
= 35