t-charts and graphing

First, you are going to learn how to draw the "bare bones" of the chart. Then you will learn how to calculate and organize your chart values within the table.

Using the TChart

First, you will need to draw a table with 2 columns as shown below. Be sure to include enough row space for the anticipated number of x-values that you intend to include. The left column for the x-values can be slightly narrower than the right column for the y-values.

external image t-chart-1.png

The left column will be used for your x values, while the right column will be used for your y values. For example, if the equation you wish to plot is y = x + 1, then write the following.

external image t-chart-2.png

Now choose the x values you wish to plot. Here is a general guideline: Pick at least 3 different values, so that you easily see if you have calculated one of the y values wrong when you plot it and join the points. The rest is really up to you to decide. So long as the x coordinates you choose produce a graph that is useful (and correctly follows the equation) to solve your problem, you are fine.

external image t-chart-3.png

Once you have decided on the x values, calculate the y values and populate the table.

external image t-chart-4.png

Table of Values

The table of values is identical to the tchart. The only difference is just the orientation. Here is the chart you saw in the last section.

external image t-chart-5.png

Here is its equivalent table of values. Notice the difference in orientation from the original chart.

external image t-chart-6.png

Variables and Fact Families:

Why do two negatives equal a positive?



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