Question

if line segment AB is parallel to the line segment CD, what is the value of y? ( refer to the picture above)
(a) 12
(b) 15
(c) 18
(d) 20
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Answer 1

Answer:

your answer is 15

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Answer 2

5y + y + 2y + y = 180° (sum of co-interior angles between two parallel lines traversed by a line is 180°)

9y = 180°

y = 20°