Question

Sistema:
X-y=6
X/y= 10/7

Answer 1

$x=6+y \\ Substituindo \\\frac{6+y}{y}= \frac{10}{7} \\ 10y=7(6+y) \\ 10y=42+7y \\ 10y-7y=42 \\ 3y=42 \\ y= \frac{42}{3} \\ y=14 \\ x-14=6 \\ x=6+14 \\ x=20$