Two chords AB and CD intersects at point O in the circle. If AO = (x – 4), OB = (y + 7), CO = (x – 2) and OD = (y + 3), then which of the following is true?

1
x – y = 5
2
x – 2y = 8
3
2x – y = 11
4
2x – 3y = 15

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