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A chemist is heating water so it can dissolve a larger amount of sodium chloride. The water's temperature increases 7°C each minute from an initial temperature of 21°C. Write an equation that shows how the temperature of the water in °C, y, depends on the number of minutes the chemist has been heating it, x.

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A chemist is heating water so it can dissolve a larger amount of sodium chloride. The water's temper...

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