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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| 3x-2y=6;-5x-25y=-5 | | -3x-4y=2;-6x-8y=4 | | 6x+2y=0;-5x-y=-1 | | 6x+2y=0;y=1-5y | | x+3y=7;5x-6y=0 | | -2x-2y=4;2x+2y=-4 | | 10-S/3=S;S | | 3x-2y=4;8x+3y=2 | | -3x-4x=2;8y=-6x-4 | | 2x+y=130;x+2y=140 | | 6x+4y=8;-x-4y=12 | | x+3y=7;3x-3y=5 | | -2x-6y=6;24y=-8x-24 | | 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 |