On a school map, the points (-1, -9), (-1, -1), (7, -9), and (7, -1) represent the four corners of a sand park.

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On a school map, the points (-1, -9), (-1, -1), (7, -9), and (7, -1) represent the four corners of a sand park. 

What are the coordinates of the center of the sand park?

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Create two linear equations.  The first is with upper right and lower left points.  The other is with lower right and upper left points.  Solve for the intersection.

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A scale drawing of a storage box on a coordinate grid shows a square with the points (-4, 2) and (-1, 4) as the locations of two adjacent vertices. 

Which pair of coordinate points could represent the other two vertices?