The Taylor family and the King family are each camping at a different national park. Let x represent the number of nights camping and y represent the total cost ($). The linear equation that represents the Taylor's total cost passes
through the points (0, 15) and (5, 90). The linear equation that represents the King's total cost passes through the
points (0, 0) and (7, 105). Determine if the national parks ever charge the same amount for a certain number of
nights, always charge the same amount, or never charge the same amount for the same number of nights.