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2p - q = -18 -----» dikalikan 4
3p + 4q = -16
8p - 4q = -72
------------------- +
11p = -88
p = -88/11 = -8
3.-8 + 4q = -16
-24 + 4q = -16
4q= -16 + 24 = 8
q=8/4 = 2
p+q = -8 + 2 = -6
2p-q=-18 lx3l
6p+8q=-32
6p- 3q=-54
——————— -
11q=22
q=22/11
q=2
3p+4q=-16
3p+4(2)=-16
3p+8=-16
3p=-16-8
3p=-24
p=-24/3
p=-8
Hp{-8,2}
Jadi p+q= -8+2=-6