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Write the equation represented by the diagram at right.  

  1. Simplify as much as possible and then solve for .

    Change all subtraction to addition.

    Combine like terms

    Add 2 to both sides.

    Move the variable to one side of the equation.

  2. Check your solution.

    Insert the number you got for into your original equation to make sure it is correct.

Shaded tile is plus 1.  Tile is negative 1.

A 4 region equation mat with tiles as follows. Positive left: 1 positive unit & 3 negative units. Negative left: 3 negative x's. Positive right: 1 negative x & 3 negative units. Negative right: 2 positive units & 1 positive x.

Use the eTool to manipulate the Algebra tiles to help you with this problem.
Click the link at right for the full version of the eTool: 4-9 HW eTool