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Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?

A+b= 17, ab=70, find the value of |a-b|