If M (5, 2.5) is the midpoint of line XY and X is (-4, 1) and Y = (a, 4), what is the value of a?

I honeslty have no idea how to do this and i really need help asap! thanks!
in Algebra 2 Answers by Level 1 User (180 points)

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1 Answer

The midpoint of a line is the average of the end points. The average of the x values is (a-4)/2 and the average of the y values is (1+4)/2=2.5, which ties in with the y value of M. So (a-4)/2=5, a-4=10 and a=14.

by Top Rated User (1.1m points)

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