Question 134495
Angle x and angle y are supplementary, so x + y = 180.
angle x is 9 more than twice angle y, so x = 2y + 9.
substituing 2y + 9 for x in the first equation, we get (2y + 9) + y = 180.

Solve for y - 2y + 9 + y = 180    add the y's together
              3y + 9 = 180        subtract 9 from each side   
              3y = 171            divide both sides by 3  
               y = 57
So, if x + y = 180 then x + 57 = 180 and x = 123
So x = 123.  And y = 57.

To check - Is 123  9 more than twice 57?  (2 X 57) + 9 = 114 + 9 = 123  CHECK!