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f(-3) = a.-3 + b
f(3) = a.3 + b
harus ada 5 bagian
a.) -3a + b = -15
3a + b = 9
_____________+
2b = -6
b = -6 : 2 = -3
b.) -3a + b = -15
3a + b = 9
_______________-
-6a = -24
a = -24 : -6 = 4
f(x) = 4x + (-3) = -2
c.) f(-2) = 4. (-2) + (-3)
= -8 + (-3)
= -11
d.) f(2) = 4.2 + (-3)
= 8 + (-3)
= 5
e.) f(-2) + f(2) = -11 + 5
= -6