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bayangan dari x=-3
f(-3) = -3(-3)+6
f(-3) = 9+6
f(-3) = 15
y = 15
bayangan dari x=2
f(2) = -3(2)+6
f(2) = -6+6
f(2) = 0
y = 0
b.
f(a) = -9
f(a) = -3a +6
-3a+6 = -9
-3a = (-9)-6
-3a = -15
a = 5
=15
f(2)=-3.2+6
=-6-6
=0
B. f(a)=-9
-9=-3x+6
3x=15
x=15/3=5