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kalo aku punya f(4) = - 3
berarti xnya aku ganti 4 kan :)
1. f(4) = 4a + b
-3 = 4a + b
klo punya f (-2) = 9
2. f(-2) = -2a + b
9 = -2a +b
pake eliminasi nih hehehe
4a + b = -3
-2a + b = 9
------------------ -
6a = - 12
a = -2
b = - 4 ( -2) - 3
b = 5
jd fungsinya f(x) = -2x + 5
semoga membantu, belajar lg yaa :)