Помогите пожалуйста с 1 (а) и со 2 задание м из 2 варианта

1/a)[latex] \left \{ {{x-y=4} \atop {2x+y=2}} \right. [/latex] [latex] \left \{ {{y=x-4} \atop {3x=6}} \right. [/latex] [latex] \left \{ {{y=x-4} \atop {x=2}} \right. [/latex] [latex] \left \{ {{y=2-4} \atop {x=2}} \right. [/latex] [latex] \left \{ {{y=-2} \atop {x=2}} \right. [/latex] Ответ: (2;-2) 2. [latex] \left \{ {{2x+3y=5} \atop { \frac{y}{2} = \frac{x}{5} }} \right. [/latex] [latex] \left \{ {{2x+3y=5} \atop {5y=2x}} \right. [/latex] [latex] \left \{ {{2x+3y=5} \atop {5y-2x=0}} \right. [/latex] [latex] \left \{ {{8y=5} \atop {2x=-5y}} \right. [/latex] [latex] \left \{ {{y= \frac{5}{8} } \atop {x= \frac{-5y}{2} }} \right. [/latex] [latex] \left \{ {{y= \frac{5}{8} } \atop {x= -\frac{5* \frac{5}{8} }{2} }} \right. [/latex] [latex] \left \{ {{y= \frac{5}{8} } \atop {x= -\frac{ \frac{25}{8} }{2} }} \right. [/latex] [latex] \left \{ {{y= \frac{5}{8} } \atop {x= -\frac{ 25 }{16} }} \right. [/latex] [latex] \left \{ {{y=0.625 } \atop {x= -1.5625 }} \right. [/latex] Ответ: (-1,5625; 0,625)