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Verified answer
F(x) = ax + bf(-2) = 7
-2a + b = 7 ... (1)
f(3) = 3
3a + b = 3 ... (2)
-2a + b = 7
3a + b = 3
---------------- (-)
-5a = 4
a = -4/5
3a + b = 3
b = 3 - 3a = 3 - 3(-4/5) = 3 + 12/5 = 27/5
f(x) = ax + b
f(x) = -4/5 x + 27/5