Answer:
x = -6
Explanation:
The sum of two interior angles in a triangle is equal to an exterior angle that is supplementary to the third interior angle.
We can write the following equation based on this information to calculate value of x:
64 + 27 = 97 + x
91 = 97 + x
- subtract 97 from both sides
91 - 97 = 97 - 97 + x
- -97 will eliminate the 97 on the right side of the equation
-6 = x