Answer:
y = 23
Step-by-step explanation:
The angle vertically opposite 3y is congruent, then
(5y - 4) and 3y are same- side interior angles and sum to 180°, that is
5y - 4 + 3y = 180
8y - 4 = 180 ( add 4 to both sides )
8y = 184 ( divide both sides by 8 )
y = 23
