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eliminasi ke dua persamaan
p + 2q =1 (x2) ---> 2p + 4q =2
2p -q =-8 (x1) ---->2p -q =-8
____________-
5q =10
q=2
substitusi q=2 ke p + 2q =1
p + 2(2) =1
maka p= =-3
kembali kepemisalan tadi
p= -3 --> 1/x = -3
maka x= -1/3
q=2 --> 1/y =2
maka y =1/2