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b.f(x) = -5x - 4
c.-19 dan 46
f(x) = mx-4
f(-2) = m(-2)-4
6 = -2m-4
2m = -4-6
2m = -10
m = -5
C.
f(x) = mx -4
f(3) = (-5)(3) -4
(3) = -15 -4
f(3) = -11
f(x) = mx-4
f(-10) = (-5)(-10) -4
f(-10) = 50 -4
f(-10) = 46