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  1. Mary says that you can find an x-intercept by substituting 0 for x, while Michelle says that you need to substitute 0 for y. Homework Help ✎

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

    2. Use the correct approach to find the x-intercept of −4x + 5y = 16.

One way to view this is graphically: the x-intercept lies any wherealong the x-axis.

Michelle is correct. The x-intercept always has a y-coordinate of 0 because it lies on the x-axis.

Substitute 0 for y and then solve for x.