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Distance Formula, Unknown y-coordinate

Q: Find the possible values of a, if the distance between the points is 5, and the coordinates are (1,1) and (4,a). Thank you.

A: Are you familiar with the distance formula? The distance d, between two points (x1,y1) and (x2,y2) is given by:

In your question, . Rearrange the distance formula . . . → Read More: Distance Formula, Unknown y-coordinate