rumus fungsi g(x)=ax+b jika g(-5)=29 dan g(7)=-19 Tentukan nilaing g(8)

g(x)= ax+b
g(-5) =-5a+b = 29
g(7) = 7a+b = -19
__________ -
-12a = 48
a = -4

7a+b = -19
-28+b= -19
b = 9

g(8)= (-4)(8)+9
=-32+9
= -23