Question

{x-y=11,5
{x/7=y/2
Me ajudem por favor

Answer 1

$x-y=11,5 \\x=11,5+y \\ \\ \frac{x}{7} = \frac{y}{2} \\ \frac{11,5+y}{7} = \frac{y}{2} \\ 23+2y=7y \\23=7y-2y \\23=5y \\y= \frac{23}{5} \\ \\x=11,5+y \\x=11,5+\frac{23}{5} \\x=\frac{57,5+23}{5} \\x=\frac{80,5}{5}$