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3p+4q=-16
2p-q=-18
menggunakan eliminasi
3p+4q=-16 |x2
2p-q=-18 |x3
menjadi:
6p+8q=-32
6p-3q=-54
-------------------- -
11q=22
q=2
substitusikan q=2 ke persamaan:
2p-q=-18
2p-2=-18
2p=-16
p=-8
jadi
p+2q= -8+2(2)= -4