rozwiąż uklad rownan metoda podstawiania 1) 3x-y ------- =2 x+2 y 4(x-2)-3(y+5)=-6 2)3(2x+3)-5(3y-2)=22 x-3y ------------- =-1 4x-7y

1. (3x-y)/x+2y=2|×(x+2y) 4(x-2)-3(y+5)=-6 3x-y=2x+4y 4x-8-3y-15=-6 x=5y 4*5y-3y=17 x=5y 17y=17 x=5y y=1 x=5 y=1 2. 3(2x+3)-5(3y-2)=22 (x-3y)/4x-7y=-1 |×(4x-7y) 6x+9-15y+10=22 x-3y=-4x+7y 6x-15y=3 5x=10y 6x-15y=3 x=2y 6*2y-15y=3 x=2y 12y-15y=3 x=2y -3y=3 |÷(-3) x=2y y=-1 x=-2