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6-7.

Rewrite the equation by undoing the operations on x, that is solve for x.

Now use your result to write the inverse function.

y = 2x + 6

The line of symmetry is y = x.

Use the eTool below to view the graphs of the lines in this problem.
Click the link at right for the full version of the eTool: A2C 6-7 HW eTool