m∠GHI = 3x° and m∠LMN = 17x°. If ∠GHI and ∠LMN are supplementary, find the measure of each angle.

If they are supplementary then 3x + 17x = 180

20x = 180

x = 9     
m<GHI = 27 degrees
m < LMN = 153 degrees