Question

If you answer this question you are a real stud:
X+Y=1
X-Y=1
Find the value of X and Y if Y≠0

Answer 1

X+Y = 1
X= 1-Y
put the value of X.
X-Y = 1
1-Y- Y = 1
-2Y = 1-1
Y= 0-2 = 0
X = 1-Y= 1-0 = 1