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f(-2) = 3.-2 + 9 = -6 + 9 = 3 (a)
f(b) = 3b + 9 = -6 ---> 3b = -6 - 9 --> 3b = -15 -->b = -15/3 = -5
nilai a + b = 3 + (-5) = -2 (B)
f(-2) = 3.-2 +9
=3
f(b) = 3b+9=-6
3b=-15
b=-5
a+b=3+(-5)
=-2