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f(-2)= -2p + q = 11
2p + q = -5
-2p + q = 11
____________ -
4p = -16
p = -4
2p + q = -5
2(-4) + q = -5
q = 3
Rumus fungsi = f(x) = px + q
f(x) = -4x + 3
f(-2)⇒ -2p + q = 11
persamaan garis
2p + q = -5
-2p + q = 11 _ eliminasikan
4p = -16
p = -4
subtitusikan
2p + q = -5
2(-4) + q = -5
q = 3
Rumus fungsi
f(x) = px + q
f(x) = -4x + 3