n0 8 pake jalan .........................................

y = px + q

diketahui
-3 = p + q
9 = 3p + q
---------------- (-)
12 = 2p
6 = p

subtitusikan p = 6 ke pers. p + q = -3
p + q = -3
6 + q = -3
q = -9

jawabannya A

jawaban : a
maaf kalau salah