2x^2-5xy-3y^2-14y-8
2x^2+xy-y^2+3x+1
solution of 800/0.5
2x^2+xy-y^2+3x-3y-2
2x^2-7xy+6y^2+7x-11y+3
solution 500/0.2
2x^2+7xy+3y^2+13x+14y+15
2x^2+3xy-2y^2+2x-11y-12
2x^2-3xy-2y^2-2x-11y-12
3(1x-4x)=-36
