Question

A pot of water is being heated up the temperature of the water can be modeled by this equation with y representing the temperature in degrees Fahrenheit and d representing the time in minutes that the water has be on the stove

y = 9.5x + 62.1
After how many minutes will the temperature of the water be 138.1 Fahrenheit?
|?| Minutes

Answer 1

8 minutes

Explanation:

To answer this, set the function y = 9.5x + 62.1 = to 138.1 and solve the resulting equation for x:

9.5x + 62.1 = 138.1

We must isolate x. Start this process by subtracting 62.1 from both sides of this equation, obtaining:

9.5x = 76

Now divide both sides of this equation by 9.5:

x = 76/9.5 = 8

The water reaches 138.1 degrees F after 8 minutes.