Hey there!!
x + y = 1 --------- ( 1 )
x - y = 1 ---------- ( 2 )
If we add both the equation, we get
2x = 2
x = 1
Now substitute this into any equation,
1 + y = 1
y = 0
Y = 0
Hope my answer helps!
We can solve these two equations as a system. Call them (A) and (B). Either substitution or elimination could be used.
(A) x + y = 1
(B) x - y = 1
By elimination (or linear combination), we add so that the y terms go to zero.
2x = 2. <----after adding
x = 1 <-----divide both sides by 2
With x = 1, we put that into our original equation. Let's go into (A)
x + y = 1
1 + y = 1
y = 0
Thus x = 1 and y = 0
