A coordinate plane can be used to represent a point or series of points. A graph is made up of two perpendicular number lines, called the coordinate axes:
The coordinate axes break the graph into four sections, called quadrants. These quadrants help with the proper plotting of positive/negative inputs and positive/negative outputs:
All points are represented as (x, y). This means that the first number should be plotted on the x-axis, and the second number should be plotted on the y-axis. For example, we can use the following list of coordinates and plot them on a graph: (0, -6), (1,-4), (2,-2), (3,0), (4,2), (5,4)
You can see that the point in the top right is located 5 units to the right and 4 units up; this is point (5, 4). The point in the bottom left is exactly on the line (0 units left or right) and 6 units down; this is point (0, -6).
Now let’s examine a practice problem:
In order to solve this problem, first identify what quadrant point B is in. It is in the upper right quadrant, Quadrant I. This means both coordinates should be positive (+, +). Now you can count the x-coordinate, by counting the spaces: 6 spots to the right. Then you can count the y-coordinate: 4 spots up. Therefore, the coordinates are (6, 4), so the answer is D!
Answers to Practice Problems