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2p-q+2r = 12 ... (2)
3p+2q+r = 8 ... (3)
Eliminasi pers 1 dan 2
p+q+r = 12 (x2) --> 2p+2q+2r = 24
2p-q+2r = 12 (x1) --> 2p-q+2r = 12 _
3q = 12
q = 4
Eliminsai pers 1 dan 3
p+q+r = 12
3p+2q+r = 8 _
-2p-q = 4 ... (5)
Substitusi q=4 ke pers 5
-2p-4 = 4
-2p = 8
p = -4
substitusi ke pers 1
p+q+r = 12
-4+4+r = 12
r = 12
(q.r)/p = (4.12)/-4 = -12
semoga membantu ya :)