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-3a + b= -15
3a + b = 9
______________ +
2b = -6
b = -3
-3a + (-3) = -15
-3a = -15 + 3
-3a = -12
a= 4
f(-2) = (-2)a+b
= (-2) 4 + (-3)
= -8 -3
= -11
f(2) = 2 (4) + (-3)
= 8 - 3
= 5