Answer :
x=y+2
2y=x-1
substitute x=y+2 into 2y=x-1
2y=x-1
2y=y+2 -1
2y - y = 1
y = 1
x=y+2
x=1+2
x=3
answer
x = 3 and y = 1
2y=x-1
substitute x=y+2 into 2y=x-1
2y=x-1
2y=y+2 -1
2y - y = 1
y = 1
x=y+2
x=1+2
x=3
answer
x = 3 and y = 1