The water level in a glass decreases 0.4 cm each hour due to evaporation.  At the beginning of the experiment, the water level is 12.6 cm.  Let x represent time, in hours, elapsed since the beginning of the experiment and let y represent the water level, in centimeters.  Part A Construct a linear function, using x and y from above, that determines the water level at a given time, in hours, after the experiment begins.

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