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a. Menentukan a
g(x) = ax+13
4 = a(-3)+13
4 = -3a+13
4-13 = -3a
-9 = -3a
3 = a
b. Menentukan g(12) dan g(-7)
g(x) = 3x+13
g(12) = 3(12)+13
g(12) = 36+13
g(12) = 49
g(-7) = 3(-7)+13
g(-7) = -21+13
g(-7) = -8
Semoga membantu :)