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f(-5) = a(-5) + b = 15 3a + b = -1 - 3(-2) + b = -1
= -5a + b = 15 -8a = 16 -6 + b = -1
f(3) = a(3) + b = -1 a = 16/-8 b = -1 + 6
= 3a + b = -1 = -2 = 5
2a + 3b =
2(-2) + 3(5) =
-4 + 15 = 11