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f(-2) = a . (-2) + b = 14
= -2a + b = 14
f(3) = a . 3 + b = -1
= 3a + b = -1
-2a + b = 14
3a + b = -1 _
-5a = 15
a = 15 / -5
a = -3
f(x) = ax + b
f(-2) = -3 . -2 + b =14
6 + b = 14
b = 14 - 6
b = 8