g(x)=ax+b. jika g(3)=-5 dan g(-2)=10. maka g(5) + g(2) adalah

g(x) = ax+b
g(3) = a(3)+b =-5
g(-2) = a(-2)+b = 10

metode eliminasi
3a+b = -5
-2a+b = 10

= 5a = -15
a = -3

3a+b = -5
3(-3)+b = -5
-9+b=-5
b=-5+9
b = 4

g(5) = -3(5) + 4 = -15+4 =11
g(2) = -3(2) + 4 = -6 + 4 = -2

g(5) + g (2) = 11 + (-2) = 9