The measure of the supplement of an angle is three times the measure of the complement. Solve for the angle.

I just want to find the equation but I do not understand it. I know that the angle is 40 degrees. Please teach me how to find the equation

2 answers

If two angles are complementary, they add to 90.

if two angles are supplementary, they add to 180.

So, if your angle is x, then its supplement is (180-x), and its complement is (90-x).

Now you can derive the needed equation and solve it.
oh, yeah. The angle is not 40°