Question

помогите пожалуйста.

Answer 1

$\displaystyle \left \{ {{7x-2y=2} \atop {-2x+4y=20}} \right.\\\\ \left \{ {{x=\frac{2}{7}+\frac{2}{7}y } \atop {-2x+4y=20}} \right.\\\\ -2(\frac{2}{7}+\frac{2}{7}y)+4y=20\\\\ y=6\\\\ x=\frac{2}{7}+\frac{2}{7}*6\\\\ x=2 \\(x,y)=(2,6)$