Question

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? Enter your answer in the box.

Answer 1

the tub will have 17.8 gallons of water remaining after 3 minutes

Explanation:

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Answer 2

y = -7.3x + 39.7
The first thing we must do for this case is to make use of the given equation and replace the value of y:
17.8 = -7.3x + 39.7
Now we clear x:
7.3x = 39.7-17.8
x = (39.7-17.8) / (7.3)
x = 3
Answer:
the tub will have 17.8 gallons of water remaining after 3 minutes