 Finding an Endpoint Example 1: 
We have a line segment with one endpoint and the midpoint known.The object is to find the other endpoint.We've included a graph, but you won't always have one. Don't guess; the graph could be inaccurate, or the answer could be a decimal. We're going to use the midpoint formula, and then solve it backwards. 
 where (-5, -3) is one endpoint, (x, y) is the other, and (-1, -2) is the midpoint. We now have two equations to solve: 
Here's a second example, without a graph: Example 2: "A line segment has midpoint (-3, 0.5) and one endpoint (-1, 5). Find the other endpoint". We'll call the missing endpoint (x, y) Write the midpoint formula backwards and fill in point (-1, 5) and the midpoint (-3, 0.5) 
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