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Mary says she can find the intercept of the equation by substituting for , while Michelle says she needs to substitute for .

  1. Who, if anyone, is correct and why?

    One way to view this is graphically: the -intercept lies anywhere along the -axis.

    Michelle is correct. The -intercept always has a -coordinate of because it lies on the -axis.

  2. Use the correct approach to determine the intercept.

    Substitute for and then solve for .