CPM Homework Help : CC3MN Problem 3-7

On your paper, write the equation represented on the Equation Mat at right. Simplify as much as possible and then solve for $x$ .

A 4 region equation mat with tiles as follows. Positive Left: 2 negative units, 1 positive unit, and 1 positive x. Negative Left: 3 positive units, and 1 negative x. Positive Right: 6 positive units. Negative Right: 1 positive unit, and 1 negative unit. Shaded tile is plus 1. Tile is negative 1.

Hint:

Move all tiles in the "minus" region to the "plus" region by flipping the tiles and remove any zero pairs. Write the equation represented.

More Help 1:

$2x-4=6$

Solve for $x$ .

More Help 2:

$2x−4=6$
$+4+4$

$\frac{2{\it x}}{2} = \frac{10}{2}$

Answer:

$x=5$

Use the eTool below to help solve the problem.
Click the link at right for the full version of the eTool: 3-7 HW eTool