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g(-2)= -2a+b = 17
eliminasi jadi
7a = -49
a= -7
substitusi ke persamaan 1
b= -35+b = -32
b= 3
g(12)= -7(12) + 3
= -84+3 = -81
g(5) = a(5)+b= -32
= 5a+b= -32
g(-2)= a(-2)+b=17
= -2a+b=17
eliminasi :
5a+b=-32 dikurang -2a+b=17 hasilnya a = -7
substitusi:
-2a+b=17
-2(-7)+b=17
14+b=17
b= 17-14
b= 3
jadi kalau g(12)= -7(12)+3
= -84+3
= -81
maaf kalau salah :)