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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| x^2+y^2=17;y=x+3 | | x+5y=1;4x+4y=-12 | | x-2y=-1;-x+5y=-2 | | 5x-8y=28;y=x-5 | | 2g+h=3;-4g+5h=-27 | | 5a+b=-34;-5a+7b=2 | | x+y=200;2x+y=250 | | 6e+5f=-12;-5e+3f=-33 | | -7v+3w=-60;7v+w=36 | | 2x+7y=0;-6x-y=-40 | | 5c+3d=-11;-2c+5d=-39 | | 2m+n=11;4m-7n=-5 | | 3p-7q=-36;9p+q=24 | | 4a+7b=35;8a-5b=51 | | 3x-2y=-2;9x+5y=38 | | 3g+4h=17;-6g+7h=-49 | | -3a+4b=31;6a-b=-13 | | -5e+f=-9;4e+5f=-16 | | -4v+w=34;5v+4w=-11 | | 6x+5y=27;-6x+y=-45 | | -6c+d=-12;4c-3d=22 | | 4m+7n=27;6m-7n=23 | | 8p-7q=-4;24p-q=68 | | 7a+2b=31;21a-b=58 | | 4x-y=10;8x+7y=74 | | -2g+5h=-20;3g+h=13 | | 4a+5b=22;-2a+7b=46 | | 3e+f=-23;-6e+5f=32 | | 8v+7w=13;-6v-5w=-11 | | -3x+5y=-50;-x-7y=44 | | -3c+d=12;4c-5d=-27 | | 5m-7n=-34;10m+n=37 |