Glencoe Math: Course 1, Volume 1
GM
Glencoe Math: Course 1, Volume 1 View details
6. The Coordinate Plane
Continue to next subchapter

Exercise 11 Page 399

The x-coordinate represents the horizontal shift, starting from the origin, and the y-coordinate represents the vertical shift.

Label: N
Quadrant: None

Practice makes perfect
An ( x, y) ordered pair is plotted on a coordinate plane by finding the x-coordinate on the horizontal axis and the y-coordinate on the vertical axis. Let's take a look at the point we want to graph and label on a coordinate plane. ( -0.5, 0)

To graph this point we should first move 0.5 units in the negative horizontal direction starting from the origin. We move in the negative direction because the x-coordinate is a negative number. Then we should move 0 units in the positive vertical direction. Let's do it!

From the diagram, we see that the point (-0.5,0) matches with the label N. To determine the quadrant in which a point lies without graphing, observe the signs of the x- and y-coordinates.

Quadrant x-coordinate y-coordinate
Quadrant I Positive Positive
Quadrant II Negative Positive
Quadrant III Negative Negative
Quadrant IV Positive Negative
Since the point lies on an axis, (-0.5,0) does not lie in any Quadrant.

Extra

Visualizing Quadrants

To help us visualize each of the different quadrants, let's take a look at the diagram.

Therefore, we are able to determine in which quadrant a point is located only by looking at the signs of coordinates of this point.