Answer
The angle on the left measures 100, and the angle on the right measures 80.
Work Step by Step
The labeled angles form a same-side interior angle pair. The same-side interior angle postulate tells us they are supplementary.
$5x+4x=180\longrightarrow$ definition of supplemntary
$9x=180\longrightarrow$ combine like terms
$x=20\longrightarrow$ division property of equality
Substitute to find the angle measures.
$5x=5(20)=100$
$4x=4(20)=80$
