Find each angle measure in the figure.

A triangle with angles labeled 4 y degrees, 20 degrees, and left-parenthesis y minus 10 right-parenthesis degrees.

The angle measures are $20\degree$,
°, and
\left(y-10\right)
°.
Question 2
Use the equation to justify your answer.
$20+\left(y-10\right)+4y=$

$y=$