Question 655253
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
A = 3y
B = 2A   
B = {{{2*3y = 6y}}}
Angles supplementary: 
  A + B =  180°
 3y + 6y = 180°
     9y = 180°
      y = 20°