The number of cars (c) in a parking lot increases when the parking lot fee (f) decreases. Right there correct equation for the scenario, and for the number of cars when the fee is six dollars.

If fee be y and cars be x

This is an inverse proportionality

• k is a constant of proportionality

• when c is 15, f is 20, therefore;

• Therefore, the equation is :

→ when f is 10:

negative shows decrease

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0