The angles below are supplementary. What is the value of x? A pair of supplementary angles is shown. One angle measures 3x + 40, and the other angle measures 80.
16.6
20
26.7
40
supplementary angles add up to 180 degrees and with the given information you should be able to get the equation (3x+40)+80=180. Simply solve for X from there. X should equal 20.
