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Lesson: Geometry Challenging - 21

Locations On The Coordinate Plane

[Page 21 of 32]

Points on the two-dimensional coordinate plane are defined with two coordinates: (x, y). The x-coordinate measures the horizontal distance from the y-axis. The y-coordinate measures the vertical distance from the x-axis.

By convention, the axes cross at the coordinates (0, 0). The x-coordinate increases to the right, and the y-coordinate increases upward.

So, a point with coordinates (5, –4) lies 5 units along the x-axis to the right of (0, 0) and 4 units along the y-axis downward, below the x-axis.

Because the axes cross at (0, 0) the coordinate plane is divided into quadrants. x and y are both positive in the upper right quadrant, while both x and y are negative in the lower left quadrant. In the upper left quadrant, x is negative and y is positive, and in the lower right quadrant x is positive and y is negative.

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