Question

(e )×+y= -37. ×+4y = 79

Answer 1

$x+y= -37. \\ x+4y = 79$
substituimos fica assim:$x=79-4y$
$x+y= -37 \\ 79-4y+y=-37 \\ -4y+y=-37-79 \\ -3y=-116*(-1) \\ y= \frac{116}{3} \\ \\ y=38,6$

$x+4y = 79 \\ x+4.38,6=79 \\ x+154,4=79 \\ x=79-154,4 \\ x=-75,4$