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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| 1/3x-1/4y=2;-2/3x-3/4y=1 | | 10x-y=10;-3x-y=-5 | | 3x-y=13;2x-y=10 | | -3x-4y=2;8y=-6x-3 | | -3x-4y=2;8y=-6-4 | | -4x+y=-13;2x-5y=-7 | | x-2y=2;14y=7x+3 | | 1.5x-y=-3;-5x-4y=16 | | 2x-y=3;3x+3y=5 | | 8x-8y=-80;4x-4y=-40 | | 5x+7y=3;2x-2y=6 | | a-2b=2;a-b=6 | | -4x-6y=16;6y=-4x-16 | | 4x+2y=10;1x-1y=13 | | -5/7-11/7x=-y;2y=7+5x | | -16+20x-8y=0;36=-18y-22x | | -16y=22+6x;-11y-4x=15 | | 0=-2y+10-6x;14-22y=18x | | x-2y=6;-2x+4y=-8 | | 3x+y=15;2x+2y=6 | | 2x+4y=32;-2x-6y=-44 | | 2x+y=2;x-3y=-27 | | 2x+y=-7;-5x+2y=22 | | 2x-6y=8;-4x+12y=-16 | | y=3/4x+3;2x-4y=6 | | 2x+4y=8;3x-5y=1 | | 5x-4y=12;4x-5y=12 | | 5x-4y=12;y=5/4x-3 | | 4y=5x-12;y=5/4x-3 | | 3x-5y=-2;4x-7y=-3 | | -6x-4y=-64;4x-4y=-36 | | x-y=-4;y=5 |