If angle x and angle y are supplementary angles that means that their sum is 180 degrees
angle x + angle y = 180
^^^Plug what you know into the equation given above
angle x = unknown
angle y = 108
x + 108 = 180
x + 108 - 108 = 180 - 108
x = 72
Angle x is 72 degrees
Hope this helped!
~Just a girl in love with Shawn Mendes
