Ответ:

[y=c

2

,x=−

29

80c

2

]=

[y=c

2

,x=−2.76c

2

]=

[x=−

29

80y

]=

[x=−2.76]

[tex]\displaystyle\bf\\\left \{ {{2y+10x=7} \atop {10x-6y=0}} \right. \\\\\\\left \{ {{2y+6y=7} \atop {10x=6y}} \right. \\\\\\\left \{ {{8y=7} \atop {10x=6y}} \right. \\\\\\\left \{ {{y=\dfrac{7}{8} } \atop {10x=6\cdot\dfrac{7}{8} }} \right. \\\\\\\left \{ {{y=\dfrac{7}{8} } \atop {10x=\dfrac{42}{8} }} \right. \\\\\\\left \{ {{y=\dfrac{7}{8} } \atop {10x=5,25}} \right. \\\\\\\left \{ {{y=0,875} \atop {x=0,525 }} \right. \\\\\\Otvet \ : \ x=0,525 \ \ ; \ \ y=0,525[/tex]