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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| 4x^2+20X+9=0;-4x^2+20X-9=0 | | 5x+3y=-5;-3x-2y=3 | | 5x=10+2y;-6/5x+y=27/5 | | 3x+2y=0;15x+14=7y | | 3x-5y=1;5x+3y=47 | | x+y=5;x+y=-4 | | 4x-y=21;x+5y=42 | | 5x-y=11;6y=5x-41 | | x+y=14;6x-y=28 | | 0.1x+0.8y=-4.2;0.3x-0.5y=4.8 | | 1/5x+1/2y=9/5;1/5x+3y=59/5 | | 4x-5y=-26;3x-2y=5 | | 32x-28y=16;8x=7y+4 | | 15x-10y=1;15y=1+10x | | x=7y-5;-2x+14y=10 | | 9x+2y=-15;x=45-8y | | a-1.2b=-3;0.2b | | y=5x+32;y=-4x-22 | | y=6x+13;y=2x+1 | | y=7x-53;y=-4x+35 | | y2x+2;y-3/2x-5 | | x-y5;6x+3y-12 | | 4x-7y-13;x-y=1 | | x^2+5x-y=6;2x^2-x-y=-3 | | 3x+2y=7;-3x-2y=9 | | y=-2x+9;-y=2x-9 | | 2x-y=-3;-2x+y=1 | | x+y=4;y=-x-4 | | -3x+y=-1;4x+2y=28 | | 5x+3y=12;2x-5y=-20 | | x+y=3;3x-2y=-11 | | 2y-2x=-2;x+y=1 |