Answer:
z = y
Step-by-step explanation:
x+y=z
y−z=x
Substitute the second equation in for x
y -z +y = z
Add z to each side
2y -z+z = z+z
2y = 2z
y =z
Substitute the second equation into the first one:
(y-z) + y = z
Open up
2y - z = z
y = z -->
x=0
