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Verified answer
2p+q= 4 maka q=4-2p....pers.1p+2q= -1
p+2(4-2p)= -1
p+8-4p= -1
-3p= -9
p= 3
maka 2p+q=4
2(3)+q=4
6+q=4
maka q= -2