Sagot :
You just need to substitute the value of y=2 to x+y=4.
So,
x + 2 = 4
x = 4 -2 (Addition property of equality, a.k.a. transpose)
x = 2
So,
x + 2 = 4
x = 4 -2 (Addition property of equality, a.k.a. transpose)
x = 2
if the y is equals to 2 you just minus 4 by 2 and you got 2 so
x is equals to 2
x is equals to 2