prosze o pomic bardzo pilne

[latex] left { {{-y+x=2} atop {10x+12y=6}} ight. [/latex] [latex]x=2+y[/latex] [latex]-10(2+y)+12y=6[/latex] [latex]-20-10y+12y=6[/latex] [latex]2y=26[/latex] [latex]y=13[/latex] [latex]x=2+y=2+13=15[/latex]

-y + x = 2 /+y - 10x + 12y =6 x = 2 + y -10( 2+y ) + 12y = 6 x= 2 + y -20 - 10y +12y = 6 x= 2 + y -20 + 2y = 6 / +20 x= 2 + y 2y= 26 / :2 x= 2 + y y=13 x= 2 + 13 y=13 x=15 y=13