If the points (3,1), (3,-1), and (-2,-1) are 3 vertices of a rectangle in the standard (x,y) coordinate plane, what is the fourth vertex?
Notice, in the first two points (3,1) and (3,-1), the x-coordinates are the same, and in the points (3,-1) and (-2,-1) the y-coordinates are the same For the fourth point, to make a rectangle, you need to have matching y-coordinates with the point (3,1). Sounds confusing, therefore it's best to graph the given points:
(-2,1) would be the coordinates of the missing point.
- Algebra House
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