Answer:
x = 13
Step-by-step explanation:
The sum of the two angles is 90 degrees since it is a right angle
3x+ 4x-1 = 90
Combine like terms
7x -1 = 90
Add 1 to each side
7x-1+1 = 90+1
7x = 91
Divide each side by 7
7x/7 = 91/7
