## Linear Systems: Why Does Linear Combination Work (Graphically)?

A system of linear equations consists of multiple linear equations. You can think of this as multiple lines graphed on one coordinate plane. Three situations can arise when looking at such a graph. Either:1) No point(s) are shared by all lines shown2) There is one point that all lines cross through3) The lines lie on top…… Continue reading Linear Systems: Why Does Linear Combination Work (Graphically)?

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## Interactive Graphs for Exponential and Logarithmic Functions

A few more interactive GeoGebra applets have been added to my collection. Each of these graphs the function indicated in the name, with parameters that you can adjust using sliders. As you move a slider, you can watch how that parameter affects the graph of the function, and see what the resulting function definition looks…… Continue reading Interactive Graphs for Exponential and Logarithmic Functions

## GeoGebra Applets That Help Understand Equation Behavior

A list of GeoGebra applets that help students better understand the relationship between the coefficients in an equation and the corresponding graph.

## Keep Your Eye On The Variable

The following equations all have a similarity: \$latex y = |x – 8| + 5\\*~\\*y  = 4(x – 6) – 7\\*~\\*(x – 3)(13x + 11) = 0\\*~\\*y = (x + 1)^2 – 9&s=2&bg=ffffff&fg=000000\$ The similarity is that they all have expressions like (x- 6) or (13x + 11), which are often either translations or factors.…… Continue reading Keep Your Eye On The Variable

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## Analyzing Linear Equations: a summary

Explanation of key linear equation concepts: slope, intercepts, and equation forms. Discussion of how slope-intercept form, point-slope form, and standard form are related to one another. Includes general descriptions of the various starting points a student is likely to encounter in problems, and how to proceed from there.