book Maths Puzzle Numerical Ability

In the diagram above, if O is the centre of the circle, then y=

(A) 25 degrees
(B) 80 degrees
(C) 90 degrees
(D) 100 degrees

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i have another question, and this is how to find the points so that i can graph y=2x-1 this is totally different from the one i just sent to you, and i dont get how to solve th what does reflection mean?