Question

Me ajudem x-y=5 X+y=4

Answer 1

$x = 5 + y$

$5 + y + y = 4 \\ 2y = 4 - 5 = - 1 \\ y = - \frac{1}{2} = - 0.5$

$x = 5 - \frac{1}{2} \\ x = 4.5$