Question 889988
<pre>
{{{drawing(200,7250/59,-.5,4.22, -.5,2.4,

line(0,0,3,0),line(0,0,.7167358991,1.867160853),

line(.7167358991,1.867160853,3.7167358991,1.867160853),

line(3,0,3.7167358991,1.867160853),locate(3.8,2.2,D),

locate(.75,1.8,3y),locate(.4,2.2,A),locate(3,0,C),

locate(-.25,0,B), locate(.25,.45,2y-5),locate(2.1,.45,3x+3))}}}

Two adjacent internal angles of a parallelogram are supplementary,

Therefore

     &#8736;A + &#8736;B = 180°

(3y) + (2y-5) = 180

  3y + 2y - 5 = 180

       5y - 5 = 180

           5y = 185

            y = 37

Opposite internal angles of a parallelogram have equal measure.

Therefore,

          &#8736;A = &#8736;C

          3y = 3x + 3

       3(37) = 3x + 3

         111 = 3x + 3

         108 = 3x

          36 = x 

Edwin</pre>