Question 428253
x-y=1  (1)
x+y=3  (2)

Add (1) and (2) to eliminate y:

x- y + x - y =1 + 3
2x = 4
x = 4/2
x = 2

Substitute x = 2 into (1) to find y:

2 + y = 3
y = 3 - 2
y = 1

The solution is (2, 1)

Hope it will help you! Thanks!