Question

Which equation using x to represent time best represents the floor number of an elevator descending at a steady rate?

Answer 1

C. You'd be starting at a higher floor (positive number) and descending floors (negative number per x). If you assume x is time it's a little more logical and visual. 

Answer 2

Answer:

The correct option is c.

Step-by-step explanation:

The slope intercept of the function is

$y=mx+b$

where, m is slope and b is y-intercept of the line.

It is given that the floor number of an elevator descending at a steady rate. It means the value of m must be negative.

In option a and d the value of m is 2 which is a positive number. Therefore option a is and d are incorrect.

y represents the floor number and x represents the time. So, y-intercept represents the number of floor at initial stage.

The number of floor can not be a number, so the value of b must be positive.

In option b the value of b is -75 which is a negative number. Therefore option b is incorrect.

In option c the value of m is -2 which is a negative and b is 75 which is a positive number. Therefore option c is correct.