Fungsi f (x) =ax + b. Jika f (-2) =27dan f (5) =-8, maka nilai a+b=.....

-2a + b = 27
5a + b= -8
___________ _
-7a = 35
a = -5

b → -2a + b = 27
-2(-5) + b =27
10 + b = 27
b = 17

a+ b = -5 + 17 = 12