2х -3у = 1 х/у=0,75

[latex] \left \{ {{2x-3y=1} \atop { \frac{x}{y} =0,75}} \right. \\ \left \{ {{2x-3y=1} \atop {x=0,75y}} \right. \\ \left \{ {{2*0,75-3y=1} \atop {x=0,75y}} \right. \\ 1,5-3y=1 \\ -3y=1-1,5 \\ -3y=-0,5 \\ y=6 \\ \left \{ {{y=6} \atop {x=0,75*6 }} \right. \\ \left \{ {{y=6} \atop {x=4,5}} \right. [/latex]