Answer:
y = 5
Explanation:
The angle formed is a right angle which has a measure of 90 degrees. This means that the sum of the two angles is 90 degrees. Using this information we can set up an equation and solve for y
Set up equation
7y + 8 + 8y + 7 = 90
==> combine like terms
15y + 15 = 90
==> subtract 15 from both sides
15y = 75
==> divide both sides by 15
y = 5