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f(5) = 13
f(5) = a(5) + b = 13
5a + b = 13
f(-2) = -8
f(-2) = a(-2) + b = -8
-2a + b = -8
* 5a + b = 13
-2a + b = -8
_______________ -
7a = 21
a = 3
* 5(3) + b = 13
15 + b = 13
b = -2
f(x) = 3x - 2