Question 991686
Two angles are supplementary when they add up to 180 degrees. Therefore, if the measure of angle 1 is 4 times the measure of its supplement:
Let's call angle 1 4x and its supplement x.
4x + x= 180 
5x= 180
x= 180/5
x= 36 is the measure of the supplement.
Since angle 1 is 4 times the measure of its supplement:
36*4= 144 is the measurement of angle 1.