Casey C. answered 03/04/16
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The midpoint is the middle distance between two points on a line. To do this question you need to use the midpoint formula. This formula is written as follows:
((x2-x1)/2, (y2-y1)/2)
In other words, take the x coordinate from vertices B, subtract it from the x coordinate from vertices A, and divide the answer by two. You repeat the same process to find the midpoint Y coordinate by subtracting vertices B's y coordinate from vertices A y coordinate and dividing the answer by two.
((x2-x1)/2, (y2-y1)/2)
In other words, take the x coordinate from vertices B, subtract it from the x coordinate from vertices A, and divide the answer by two. You repeat the same process to find the midpoint Y coordinate by subtracting vertices B's y coordinate from vertices A y coordinate and dividing the answer by two.
This looks like
((-2-0)/2, (-2-(-9))/2)
(-2/2, 7/2)
(-1, 3.5)