Respuesta :

I strongly suggest you represent the 2 angles by 2 different letters, such as x and y.  If x and y are supplementary, they add up to ... what?

Suppose we arbitrarily let x be the larger number.  

Then x = 3y + 10   That is, x is equal to 3 times the angle y, PLUS 10 degrees more.

You will now have 2 equations:         x   +    y    =   ??
                                                          x   = 3y + 10

Eliminate x.  Find y,  Then go back and find x.

Check your work.  Angles x and y MUST add up to   ??