Option D
The value of y in the parallelogram is 34°
Step-by-step explanation:
Adjacent angles of the Parallelogram are supplementary
So,
(78° + 3y°) = 180°
78° + 3y° = 180°
Subtract 78° each side we get,
78° - 78° + 3y° = 180° - 78°
3y° = 102°
Now, Divide both side by 3 we get,
3y°/3 = 102°/3
y = 34°
Thus, The value of y in the parallelogram is 34°
-TheUnknownScientist 72