Bantu jawab dengan caranya ya

f(x) = ax + b
f(-2) = -2a + b = -7
f(-1) = -a + b = -5
------------------------- --
-a = -2
a = 2
-a + b = -5
-2 + b = -5
b = -5 + 2
b = -3

f(x) = 2x - 3