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18 July, 00:56

The amount of water in a bathtub as it drains can be modeled by this equation with y representing the number of gallons of water in the tub and x representing the time, in minutes, that the tub has been draining.

y=-7.3x+39.7

After how many minutes will the tub have 17.8 gallons of water remaining?

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min

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Answers (1)
  1. 18 July, 01:18
    0
    Given function:

    y=-7.3x+39.7

    Where y = number of gallons of water

    and x = number of minutes

    Put value of y=17.8 gallons and solving for x.

    17.8=-7.3x+39.7

    Subtract 39.7 from both sides

    -21.9=-7.3x

    Divide both sides by - 7.3

    3=x

    or

    x=3 minutes

    After 3 minutes the water in the tub will be 17.8 gallons.

    Answer: 3 minutes
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