Помогите решить {-общая скобка {(2x-y)^2-(x+3y)^2=-9 {3x+2y=-1

{(2x-y)² -(x+3y)² = -9 ;3x+2y = - 1. {(2x-y -(x+3y))(2x-y +x+3y) = -9 ; 3x+2y = - 1. {(2x-y -x-3y)(3x+2y) = -9 ; 3x+2y = - 1. {(x-4y )(3x+2y) = -9 ; 3x+2y = - 1. {(x-4y )(-1) = -9 ; 3x+2y = - 1. {x-4y =9 ; 3x+2y = - 1. ||*2||. {x-4y =9 ; 6x+4y = - 2. * * * сложим * * * {x-4y =9; 7x=7. {1 -4y =9 ; x=1⇔{y =-2; x=1. ответ: (1; -2).