At about the 4:13 mark, the teacher says it doesn't matter which one you call...y1 or y2; the teacher should note that when you name one point x1, you have to put y1 with it. So, your 2 points have to be (x1,y1) and (x2,y2).
Finding the midpoint between two points
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Questions answered by this video:
How do I find the midpoint of 2 points on a Cartesian plane?
What is the midpoint of (3,-3) and (-2,4)?
Currently 3.0/5 Stars.
The teacher shows how to find the midpoint of 2 points using both a graphical approach and an algebraic approach.