Answer:
x = 14
Explanation:
First step is to set the opposite sites equal to each other (they are congruent)
13 = 2y + 1
and
x = y + 8
Now solve for y in terms of x so you can substitute it in the other equation
x - 8 = y
Plug into equation
13 = 2(x-8) + 1
13 = 2x - 16 + 1 distribute
13 = 2x - 15 simplify
28 = 2x add 15 to both sides
x = 14
I hope this helps