Question

Find the value of x.

Answer 1

x = 9

Explanation:

A triangle's interior angles must add up to 180, and with one angle labeled as a right angle, we know that the two remaining angles must add up to 90.

So,

(3x - 5) + (7x + 5) = 90

3x + 7x - 5 + 5 = 90

10x = 90

x = 9