The square of a binomial is written like

In your case, you have
, which implies 
So, we want to write

But our left hand side is

If we add 26 to both sides, we have

Answer:
Step-by-step explanation:
Answer:
y = (7 - x) / 2
Step-by-step explanation:
You isolate the y by subtracting the x
2y = 7 - x
and then you divide by two to get the answer to y
(7 - x) / 2