This interactive pan balance allows numeric or algebraic expressions to be entered and compared. You can "weigh" the expressions you want to compare by entering them on either side of the balance. Using this interactive tool, you can practice arithmetic and algebraic skills, and investigate the important concept of equivalence.
Two other tools, Pan Balance – Numbers and Pan Balance – Shapes, are natural extensions.
Place an algebraic expression in each of the red and blue pans. These expressions may or may not include the variable x. Enter a value for x, or adjust the value of x by moving the slider.
As the value of x changes, the results will be graphed. Use the Zoom In and Zoom Out buttons, or adjust the values for the x- and y‑axes with the sliders, to change the portion of the graph that is displayed.
The Reset Balance button removes the expressions from the pans and clears the graph.
Explore algebraic equivalence with the following investigation.
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