Question

2. (5 pts) An angle, A, is 11 times larger than its supplement, B. Find the angles (be sure to say which is which).

Answer 1

So, a+2a=180°

Simplify.

3a=180°

To isolate a , divide both sides of the equation by 3 .

3a3=180°3 a=60°

The measure of the second angle is,

2a=2×60°  =120°

So, the measures of the two supplementary angles are 60° and 120° .