Question

Encontrar la solución al sistema de ecuación
(x+y)/2 = x-1
(x-y)/2 = y+1

Answer 1

1)
(x+y)/2 = x-1
x+y=(x-1)2
x+y=2x-2
y+2=2x-x
y+2=x
x=y+2

2)
(x-y)/2 = y+1
x-y=(y+1)2
x-y=2y+2
x-2=2y+y
x-2=3y
x=3y+2