Supplementary angles are angles that add to 180 degrees, so if we set the second angle to be x degrees, we can say that the first is 2x-3 degrees and therefore we have that:
(2x-3) + x = 180
3x - 3 = 180
3x = 183
x = 61 degrees
So one angles is 59 degrees and the other is 119 degrees
