Respuesta :

mathstudent55
The angles with measures 5x + 15 and 115 are corresponding angles.
For lines a and b to be parallel, those angles must be congruent.

5x + 15 = 115

5x = 100

x = 20
nicpink
5x+15=115
subtract 15 from both sides
5x=100
divide both sides by 5
x=20

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