bisa dibantu gk tengtang fungsi

f(x) = ax + b
f(2) = 2a + b = 1
f(-2) = - 2a + b = - 7
----------------------------(+)
2b = - 6
b = - 3

2a + b = 1
2a - 3 = 1
2a = 1 + 3
2a = 4
a = 2

a = 2 , b = - 3