The measure of ∠a is 55° more than three times the measure of ∠b. the sum of their measures is 155°. find m ∠a and m ∠b.

A = 3B + 55
A + B = 155

3B + 55 + B = 155
4B = 155 - 55
4B = 100
B = 100/4
B = 25 <===

A = 3B + 55
A = 3(25) + 55
A = 75 + 55
A = 130 <==

Add up all the sides