Помогите с алгеброй буду очень благодарен

1) [latex] \left \{ {{x-3y=8} \atop {2x-y=6}} \right. = \left \{ {{x=8+3y} \atop {2(8+3y)-y=6}} \right. [/latex] 2(8+3y) - y=6 16+6y-y=6 5y= -10 y = -2 x = 8 + 3*(-2) = 8-6=2 2) [latex]+ \left \{ {{4x-5y=-83} \atop {2x+5y=29}} \right. = 6x=-54[/latex] x = -9 2*(-9) +5y = 29 -18+5y=29 5y = 47 y = 9.4