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f(-3) = -3a + b = -15
f(3) = 3a + b = 9
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= -6a = -24
a = 4
f(-3) = -3(4) + b =-15
= -12 + b = -15
= b = -3
f(-2) = ax+b
= 4(-2) + (-3)
= -11
f(2) = ax+b
= 4(2) + (-3)
= 5
f(-2) + f(2)
= -11 + 5
= -6