Lesson Plan - Get It!
- How can you put numbers all in one spot so that you can get a better picture of the information presented?
- Can you use this to help you make predictions about what will happen next?
- Can you track the profit you make?
- Am I making enough profit?
- Are my sales increasing or decreasing?
We can track all that on a graph! Let's first start with plotting points.
To plot the point (3,2), we will count three to the right (in red) and two up (in green):
Here is another one. Let's graph the point (-2, 4). In this case, we will count two to the left (in red), and then 4 up (in green):
- Are you ready to get a little more into graphing?
Let's graph a line!
First, we need to know that in the linear function y = mx + b, the m value represents the slope, and the b value represents the y-intercept.
We will start with the line y = 2/3x - 4.
The slope is 2/3, and the y-intercept is -4:
We start at the y-intercept (in this case, -4). Plot a point on the y-axis at -4. This is where the line for this function intercepts, or crosses, the y-axis:
Now, we count the slope from the y-intercept.
The slope, which is represented by m, measures the steepness of the line. The steepness is the rise over the run from a certain point to the next point.
In this function, the slope, or m value, is 2/3 which means from the y-intercept, the line will rise by 2 and run to the right by 3. Plot another point here, which is (3,-2):
Now draw a line through the two points!
Now, that you know how to graph a line, let's go to the Got It? section!