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7nadin3 [17]
3 years ago
10

Find y.............​

Mathematics
2 answers:
sattari [20]3 years ago
7 0

Answer:

We know angle y = 78 degrees

Step-by-step explanation:

y and 78 are alternate exterior angles.  Alternate exterior angles are equal if the lines are parallel. AB is parallel to CD  so y = 78

Natasha_Volkova [10]3 years ago
3 0
<h3>Answer: y = 78</h3>

==================================

Justification #1: Angle x is 78 degrees as these two angles are corresponding angles (congruent due to the parallel lines). We also know that y = x because they are vertical angles. So by the transitive property, y = 78

Justification #2: The parallel lines mean that the alternate exterior angles are congruent, so y = 78 through one step (instead of multiple steps in the prior justification)

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