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f(-3) = -15
f(3) = 9
-3a + b = -15
3a + b = 9
------------ (+)
2b = -6
b = -3
3a + b = 9
3a - 3 = 9
3a = 9+3
3a = 12
a = 4
f(x) = ax + b
= 4x - 3
f(-2) = 4(-2) -3 = -11
f(2) = 4(2) -3 = 5
jadi, f(-2) + f(2) = -11 + 5 = -6