1.
elimination x+y=3, x−y=1
1.
elimination x+y=3, x−y=1
2.
elimination x+y=7, x−y=5
2.
elimination x+y=7, x−y=5
3.
elimination y=−2, −3y+4x=18
3.
elimination y=−2, −3y+4x=18
4.
elimination x+y=150, x=y+260
4.
elimination x+y=150, x=y+260
5.
elimination x−y=3, x+y=21
5.
elimination x−y=3, x+y=21
6.
elimination 12x+2y=7, y=x+5
6.
elimination 12x+2y=7, y=x+5
7.
elimination x+y=8, x−y=−4
7.
elimination x+y=8, x−y=−4
8.
elimination 8x−2y=12, 7x+3y=15
8.
elimination 8x−2y=12, 7x+3y=15
9.
elimination 60x−40y=30, −40x+90y=−10
9.
elimination 60x−40y=30, −40x+90y=−10
10.
elimination 12x+13y=9, 15x−23y=6
10.
elimination 12x+13y=9, 15x−23y=6