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.

min

Question

Marcel Callahan

Mathematics

15 November, 16:39

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.

min

+1

Answers (1)

Know the Answer?

Alejandro · Answer 1

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