Question

80

MP Persevere with Problems The equation y = 15x + 37 can be
used to approximate the temperature y in degrees Fahrenheit based
on the number of chirps x a cricket makes in 15 seconds. Graph the
equation to estimate the number of chirps a cricket will make in
15 seconds if the temperature is 80°F.
60

`y = 15x + 37`
​

Answer 1

Explanation:

D is the answer

Answer 2

The cricket make approximately 3 chirps in 15 seconds if the temperature is 80°F.

Explanation:

We are given the following in the question:

`y = 15x + 37`

The above equation is used approximate the temperature y in degrees Fahrenheit based on the number of chirps x a cricket makes in 15 seconds.

The attached image shows the graph for the given equation.

Now, we have to find the number of chirps a cricket will make in 15 seconds if the temperature is 80°F.

Putting y = 80 in the given equation, we get:

`y = 15x + 37\\80 = 15x+37\\15x = 80-37\\15x = 43\\x = 2.8667 \approx 3`

Thus, the cricket make approximately 3 chirps in 15 seconds if the temperature is 80°F.