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f(-2) = a(-2) + b
7 = -2a + b
f(3) = a(3) + b
-3 = 3a + b
-2a + b = 7
3a + b = -3
------------------ -
-5a = 10
a = 10/-5
a = -2
-2a + b = 7
-2(-2) + b = 7
4 + b = 7
b = 7 - 4
b = 3
Jadi, f(x) = -2x + 3