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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| 15x-20y=7;10y=-3+5x | | x=5y-5;-2x+10y=10 | | 5x-27=-y;4x-y=0 | | 5x-27=-1y;4x-1y=0 | | 4x+5y=3;x=3-2y | | 6x+2y=10;12x+4y=21 | | x+y=5;3x+2y=10 | | -12x+14z=-14;-14x-14z=98 | | a+s=456;350a+100s=113100 | | a+s=456;3.5a+100s=1131 | | 4a+1b=15.5;3a+2b=14.75 | | 8n=-3m+1;8(-2)=-3m+1 | | y-3x=-2;6x-2y=4 | | x+y=20;x-y=4 | | 2x+3y=1;-3x-2y=-1 | | y=3x-6;y=5x-14 | | x+4y=1;5x+4y=-11 | | 2x-2y=-2;y=4x-5 | | 6x+y=-3;5x-3y=-83 | | 2x+3y=7;3x-3y=18 | | -7x-3y=-25;-6x-4y=-20 | | 8x+y=29;8x+4y=20 | | x+8y=28;2x+5y=12 | | 4x+3y=40;x=2y-1 | | x+y=12;x=2y | | 3x+3y=10;-9x-9y=-30 | | 7y+2y^2-7;3-4y | | 0,5x+0,2y=17;x+y=17 | | x-4y=5;-x+2y=-3 | | 4x+3y=30;x=5y-4 | | 2g+3h=6;-g+5h=-16 | | 5a+b=1;-3a-7b=25 |