Write 4 expressions equivalent to 3/4

If angles are supplementary then they add up to be 180.  therefore, in our give situation, 2x + 3x - 15 = 180.  5x - 15 = 180 and 5x = 195.  we solve for x to find that x = 39.  one angle measures 2(39) which is 78 and the other measures 3(39) - 15 which is 102.  of course we check ourselves to make sure that 78 + 102 = 180 and it does work!