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-1p + q = -5
f (4)= p (4)+ q = 5
4p + q = 5
-1p + q = -5 per 4p + q = 5 (dengan tanda dikurangi)
nanti akan ketemu p = 2
lalu masukkan ke rumus salah satu.
4p + q = 5
4 (2) + q = 5
q = 5-8
q = -3
jd sudah ketemu p = 2 dan q = -3
masukkan ke rumus fungsi
f(x) = px + q
= 2x + (-3)