supplement is 4 times as large as its complement

Answer 1

x represents the measure of the angle

180 - x represents the measure of its supplement

90 - x represents the measure of its complement

180 - x = 4(90 - x)

180 - x = 360 - 4x

-x = 180 = -4x

180 = -3x

-60 = x

The angle is -60° (A little strange)