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Stephanie is working on a graph that represents the path of a roller coaster. The point (0, 840) represents the point at which the roller coaster first begins to drop at a constant rate. The point (15, 240) represents a point along the ride at which the roller coaster is still dropping. If the x-intercept represents the point at which the ride stops dropping, what is the x-intercept?

  • math -

    since y decreased by 600 when x increased by 15,

    y = 840 - 40x

    now solve for x when y=0

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