1) 23x + 4y - 7x = -3y + 1516x + 4y = -3y + 1516x + 7y = 15
2) 31x + 28y = 1460
3) 87x - 64y = 3
4) 56x + 72y = 407x + 9y = 5
5) 15x - 51y = 165x - 17y = 16
6) 3x + 4y = 7
7) 12x + 18y = 502x + 3y = 25
8) 25x + 95y = 9705x + 19y = 194
9) 102x + 1003y = 1
1) 23x + 4y - 7x = -3y + 15
16x + 4y = -3y + 15
16x + 7y = 15
2) 31x + 28y = 1460
3) 87x - 64y = 3
4) 56x + 72y = 40
7x + 9y = 5
5) 15x - 51y = 16
5x - 17y = 16
6) 3x + 4y = 7
7) 12x + 18y = 50
2x + 3y = 25
8) 25x + 95y = 970
5x + 19y = 194
9) 102x + 1003y = 1