(3y + 9) + (120) = 180
3y + 129 = 180
3y = 180 - 129
3y = 51
3y/3 = 51/3
y = 17
m∠E = 3y + 9
m∠E = 3(17) + 9
m∠E = 51 + 9
m∠E = 60°
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Answers & Comments
(3y + 9) + (120) = 180
3y + 129 = 180
3y = 180 - 129
3y = 51
3y/3 = 51/3
y = 17
m∠E = 3y + 9
m∠E = 3(17) + 9
m∠E = 51 + 9
m∠E = 60°