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Consider the graph of  and at right.

  1. Write an equation that you could solve using points and . What are the solutions to your equation? Substitute them into your equation to show that they work.

    Set and equal to each other.

  2. Are there any solutions to your equation in part (a) that do not appear on the graph? Explain.

    Solve the equation for .

  3. Write an equation that you could use to solve for the ‑coordinate of point . Estimate the solution to your equation using the graph. Again, substitute your solution into your equation. How close was your estimate?

    Set equal to .