That depends on the coordinates of the end points which have not been given.
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End-points are (-13, 19) and (4, -7). The midpoint of the segment is (-4.5, 6). The X-coordinate is-4.5 we discuss about it.
If you mean that the line segment endpoints are (-4, 0) and (7, 0) then the midpoint is (1.5, 0)
Each coordinate of the midpoint of a straight line segment is the arithmetic mean of the coordinates of the endpoints. So the y-coordinate is (0+15)/2 = 7.5
To calculate the x-coordinate of the midpoint of a horizontal segment, you simply take the sum of x-coordinate of the endpoints of the horizontal segment and divide this by two. An example is if one is given endpoints with th x and y coordinates 2,3 and 5,6. To find the midpoint of the x-coordinates add 2 and 5 and divide this by 2, or 7/2.
If you mean endpoints of (0, 0) and (0, 15) then the midpoint is at (0, 7.5)