Sagot :
Supplementary angles add up to 180, so
6x+60+90 = 180 and solve for x
6x= 30
x=5
6x+60+90 = 180 and solve for x
6x= 30
x=5
supplementary means that the angles add to 180, so solve the equation 6x+60+90=180. 6x=30 x=5