Question

Решите систему уравнений )))))

Answer 1

$\left \{ {{3x-y=10} \atop { \frac{x}{3}+ \frac{y+1}{5}=1 }} \right. \ =\ \textgreater \ y=3x-10 \\ \\ \frac{x}{3}+ \frac{3x-10+1}{5}=1 \ (*15) \\ \\ 5x+3( 3x-9)=15 \\ 5x+9x-27=15 \\ 14x=42 \\ x=3 \\ \\ \\ y=3x-10 \\ y=3*3-10 \\ y=-1$

x=3
y=-1