# How do you solve by substitution  x - 5y=10 and -2x+y=7?

$y = - 3 , x = - 5$
by substitution $x = 10 + 5 y \implies - 2 \left(10 + 5 y\right) + y = 7 \implies - 9 y = 27 \implies y = - 3$
So $x + 5 \cdot 3 = 10 \implies x = - 5$