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f(-6) = 32
f(-6) = -6p + q
-6p + q = 32...(i)
f(4) = -18
4p + q = -18...(ii)
eliminasi (i) dan (ii) didapat p = -5, q = 2
b. f(x) = px + q = -5x + 2
c. f(3) = -5.3 + 2 = -13
d. f(x) = -33
-5x + 2 = -33
-5x = 33 - 2
-5x = -35
x = 7