Question

x-2y=3

-x-2y=-7

Me Ajudem Por Favooooooooooooooooooor

Answer 1

$x-2y=3\\ -x-2y=-7\\\\\\ x-2y=3\to x=3+2y\\\\\\\\ -x-2y=-7\to -(3+2y)-2y=-7\to -3-2y-2y=-7\to \\\\ -2y-2y=-7+3\to -4y=-4\to y= \frac{-4}{-4} \to y=1\\\\\\\\ x=3+2y\to x=3+2*1\to x=3+2\to x=5\\\\\\\\ S=(5;1)$