Question

I'm having a hard time on this problem. Plz help. Will mark brainliest.

Answer 1

Answer:

y = 31

Step-by-step explanation:

We know: opposite angles in a parallelogram have the same measure.

Therefore we have the equation:

$x+y=87+y$            subtract y from both sides

$x=87$

We know: the sum of the angle measures in the triangle is 180°.

Therefore we have the equation:

$42+(x+y)+20=180$          subtitute x = 87

$42+87+y+20=180$

$149+y=180$              subtract 149 from both sides

$y=31$