ОЧЕНЬ СРОЧНО¡!!!!!! РЕШИТЕ СИСТЕМУ УРАВНЕНИЙ 5х - 3у =17 { 2х-8у=17

[latex] \left \{ {{5x-3y=17} \atop {2x-8y=17}} \right. [/latex] [latex] \left \{ {{5x=17+3y} \atop {2x=17+8y}} \right.[/latex] [latex]  \left \{ {{10x=34+6y} \atop {10x=85+40y}} \right. [/latex] [latex] 34+6y=85+40y [/latex] [latex] 40y-6y=34-85 [/latex] [latex]34y=-51 [/latex] [latex]y= - \frac{34}{51} [/latex] [latex]y= - \frac{2}{3} [/latex] 5x-3y=17 [latex]5x-3*(- \frac{2}{3} )=17[/latex] 5x+2=17 5x=15 x=3