Coordinate System. The First Quadrant The first thing you have to know about the coordinate plane...
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Transcript of Coordinate System. The First Quadrant The first thing you have to know about the coordinate plane...
Coordinate System
The First Quadrant
The first thing you have to know about the coordinate plane are the axes.
• The x-axis is horizontal. In the first quadrant the x-axis starts at 0 and goes to the right.
• The y-axis is vertical. In the first quadrant, the y-axis starts and 0 and goes up.
x-axis
y-axis
0 on the y-axis
0 on the x-axisOrigin
The origin is the point where the x-axis and the y-axis meet.
The coordinate plane is displayed below. It is made up of a horizontal number line (x-axis) and a vertical number line (y-axis).
Points on the coordinate plane are identified by combining their locations on the x-axis and the y-axis. (x,y)
1. This point did not move
along the x-axis. Its value on the x-axis is 0.
2. The point has not traveled up the y-axis. Its y-value is 0.
3. The name of this point is (0,0).
This point is the origin. Always start here when finding coordinates on the grid.
1. Count along the x-axis. This point is 2 units across the x-axis.
2. Count up the y-axis. This point is 1 unit up the y-axis.
3. Name the point. When naming points, give the x-value first and the y-value second. This point is (2,1).
In this example,• The point has not moved
along the x-axis. Its x-value is 0.
• The point moved 3 units up the y-axis. Its y-value is 3.
• The name for this point is (0,3).
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