Answer:
x= 10
Step-by-step explanation:
The total measure of this degree is 90, since it's a right angle.
So, the equation would be: 5x+4x= 90.
Step 1- Add common variables.
(5x+4x)= 90
9x= 90
Step 2- Divide 9 to both sides.
9x= 90
9 9
x= 10
Hope this helps! :)
