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5 = 4p + q _
-10 = -5p
2 = p
-5 = -2 + q
-3 = q
f(-6) = -12 + (-3) = -15
f (4) ⇒ 4p + q = 5 _
-5p = -10
p = -10/-5
p = 2
ambil salah satu garis
-p + q = -5
-2 + q = -5
q = -5 + 2
q = -3
rumus
f(x)= px + q
= 2x -3
maka
f(-6) = 2x -3
= 2 (-6) -3
= -12 -3
= -15