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Before you can use this method, you'll need to know how to locate a vertical or horizontal line. Here's how to spot it:  A line is horizontal if the two y-coordinates of the endpoints are equal. For example, the line segment with the endpoints (-3, 4) and (5, 4) is horizontal.    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/f\/f1\/Find-the-Midpoint-of-a-Line-Segment-Step-6Bullet1-Version-2.jpg\/v4-460px-Find-the-Midpoint-of-a-Line-Segment-Step-6Bullet1-Version-2.jpg","bigUrl":"\/images\/thumb\/f\/f1\/Find-the-Midpoint-of-a-Line-Segment-Step-6Bullet1-Version-2.jpg\/aid1628172-v4-728px-Find-the-Midpoint-of-a-Line-Segment-Step-6Bullet1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}  A line is vertical if the two x-coordinates of the endpoints are equal. For example, the line segment with the endpoints (2, 0) and (2, 3) is vertical.    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/9\/9b\/Find-the-Midpoint-of-a-Line-Segment-Step-6Bullet2-Version-2.jpg\/v4-460px-Find-the-Midpoint-of-a-Line-Segment-Step-6Bullet2-Version-2.jpg","bigUrl":"\/images\/thumb\/9\/9b\/Find-the-Midpoint-of-a-Line-Segment-Step-6Bullet2-Version-2.jpg\/aid1628172-v4-728px-Find-the-Midpoint-of-a-Line-Segment-Step-6Bullet2-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"} You can easily find the length of the segment just by counting how many horizontal spaces it takes up if it's horizontal, and counting how many vertical spaces it takes up if it's vertical. Here's how to do it:  The horizontal line segment with the end points (-3, 4) and (5, 4) is 8 units long. You can find this by counting the spaces it takes up or by adding the absolute values of the x-coordinates: |-3| + |5| = 8    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/53\/Find-the-Midpoint-of-a-Line-Segment-Step-7Bullet1-Version-2.jpg\/v4-460px-Find-the-Midpoint-of-a-Line-Segment-Step-7Bullet1-Version-2.jpg","bigUrl":"\/images\/thumb\/5\/53\/Find-the-Midpoint-of-a-Line-Segment-Step-7Bullet1-Version-2.jpg\/aid1628172-v4-728px-Find-the-Midpoint-of-a-Line-Segment-Step-7Bullet1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}  The vertical line segment with the end points (2, 0) and (2, 3) is 3 units long. You can find this by counting the spaces it takes up or by adding the absolute values of the y-coordinates: |0| + |3| = 3    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/6\/6e\/Find-the-Midpoint-of-a-Line-Segment-Step-7Bullet2-Version-2.jpg\/v4-460px-Find-the-Midpoint-of-a-Line-Segment-Step-7Bullet2-Version-2.jpg","bigUrl":"\/images\/thumb\/6\/6e\/Find-the-Midpoint-of-a-Line-Segment-Step-7Bullet2-Version-2.jpg\/aid1628172-v4-728px-Find-the-Midpoint-of-a-Line-Segment-Step-7Bullet2-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"} Now that you know the length of the line segment, you can divide it by two.  8/2 = 4    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/8f\/Find-the-Midpoint-of-a-Line-Segment-Step-8Bullet1-Version-2.jpg\/v4-460px-Find-the-Midpoint-of-a-Line-Segment-Step-8Bullet1-Version-2.jpg","bigUrl":"\/images\/thumb\/8\/8f\/Find-the-Midpoint-of-a-Line-Segment-Step-8Bullet1-Version-2.jpg\/aid1628172-v4-728px-Find-the-Midpoint-of-a-Line-Segment-Step-8Bullet1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}  3/2 = 1.5    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/9\/92\/Find-the-Midpoint-of-a-Line-Segment-Step-8Bullet2-Version-2.jpg\/v4-460px-Find-the-Midpoint-of-a-Line-Segment-Step-8Bullet2-Version-2.jpg","bigUrl":"\/images\/thumb\/9\/92\/Find-the-Midpoint-of-a-Line-Segment-Step-8Bullet2-Version-2.jpg\/aid1628172-v4-728px-Find-the-Midpoint-of-a-Line-Segment-Step-8Bullet2-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"} This is the last step to finding the endpoint of the line segment. Here's how you do it:  To find the midpoint of the points (-3, 4) and (5, 4), just shift over 4 units either from the left or right to reach the middle of the segment. (-3, 4) shifted over 4 x-coordinates is (1, 4). You won't need to change the y-coordinates since you know the midpoint will be on the same y-coordinate as the endpoints. The midpoint of (-3, 4) and (5, 4) is (1, 4).    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/88\/Find-the-Midpoint-of-a-Line-Segment-Step-9Bullet1-Version-2.jpg\/v4-460px-Find-the-Midpoint-of-a-Line-Segment-Step-9Bullet1-Version-2.jpg","bigUrl":"\/images\/thumb\/8\/88\/Find-the-Midpoint-of-a-Line-Segment-Step-9Bullet1-Version-2.jpg\/aid1628172-v4-728px-Find-the-Midpoint-of-a-Line-Segment-Step-9Bullet1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}  To find the midpoint of the points (2, 0) and (2, 3), just shift over 1.5 units either from the top or bottom to reach the middle of the segment. (2, 0) shifted up 1.5 y-coordinates is (2, 1.5). You won't need to change the x-coordinates since you know the midpoint will be on the same x-coordinate as the endpoints. The midpoint of (2, 0) and (2, 3) is (2, 1.5).    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/7\/79\/Find-the-Midpoint-of-a-Line-Segment-Step-9Bullet2-Version-2.jpg\/v4-460px-Find-the-Midpoint-of-a-Line-Segment-Step-9Bullet2-Version-2.jpg","bigUrl":"\/images\/thumb\/7\/79\/Find-the-Midpoint-of-a-Line-Segment-Step-9Bullet2-Version-2.jpg\/aid1628172-v4-728px-Find-the-Midpoint-of-a-Line-Segment-Step-9Bullet2-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}

Summary:
Find a vertical or horizontal line. Find the length of the segment. Divide the length of the segment by two. Count that value from either of the endpoints.