Question

Решите пожалуйста. :)

Answer 1

$\left \{ {{3x-7y=8\frac{3}{7}} \atop {4x+2y=-1\frac{5}{7}}} \right.$

$\left \{ {{12x-28y=32\frac{12}{7}} \atop {12x+6y=-3\frac{15}{7}}} \right.$

$-34y=35\frac{27}{7}$

$y=-\frac{8}{7}$

$3x+8=8\frac{3}{7}$

$3x=\frac{3}{7}$

$x= \frac{3}{21}$

$\frac{3}{21}-\frac{8}{7}=\frac{3}{21}-\frac{24}{21}=-1$