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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| x+y=12;x-y=4 | | x+y=3;2x-y=0 | | 2x+5y=0;x-5y=-15 | | 6a-5b=9;2a+5b=23 | | 5x+y=6;2y=x+1 | | 3x-y=9;2x+y=6 | | x+2y=8;-2x-2y=-10 | | 4x-y=1;3x+y=13 | | x+y=8;2x=y-5 | | x+y=8;x+y=8 | | 2x+y=1;2x-y=-5 | | x=y+3;2x+y=-3 | | 5x+y=1;3x+2y=2 | | 2x+5y=2;-3x-y=-3 | | x-2y=-1;2x-y=4 | | 2x-3y=4;x+4y=-9 | | x+2y=8;2x+y=7 | | x=4y;3x-2y=20 | | x+3y=2;2x-3y=22 | | x+7y=33;3x-2y=7 | | x+7y=39;3x-2y=2 | | m+n=1000;0.05m+0.06n=57 | | 2x+6y=24;5x-2y=9 | | 2x+6y=32;5x-2y=12 | | x+2y=7;2x+y=8 | | x-2y=0;4x-3y=15 | | 3x-y=5;2x+4y=36 | | 8x+14y=4;-6x-7y=-10 | | 2x+3y=10;5x-2y=-2 | | 3x+5y=-19;2x-y=-4 | | 4x+2y=8;6x-2y=-18 | | y=-2/3x+7;3x-2y=12 |