ceichin
Look at the parallel lines AB and CD with line EF as the transversal
What is the value of x?



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ceichin
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dw:1349832043489:dw

ceichin
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A. 25
B. 20
C. 15
D. 10

jim_thompson5910
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3x+20 and x+60 are measures of vertical angles

jim_thompson5910
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so the two angles are congruent, which means
3x+20 = x+60

ceichin
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thanks!
