Answer:
x is equal to 7
the measure of both angles is 23°
Explanation:
1. set both equations equal to each other
2. 4x - x is 3x
3. 16 + 5 is 21
4. 3x = 21
5. divide both sides by 3
6. x equals 7
Angle y is also 40 degrees. Angle x and y are vertical angles, thus they have the same angle measure.
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