Question

Martina started with 228 boxes of cookies and sold the same number each day for 4 days. After 4 days of selling, she was left with 100 boxes of cookies. Enter the slope of the line representing the change in Martina's inventory of cookies over this period of time.

Answer 1

`m = -32`

Explanation:

Let x = days and y = box of cookies

So, we have:

`(x_1,y_1) = (0,228)` -- When she started

`(x_2,y_2) = (4,100)` --- After 4 days

Required

Determine the slope

The slope (m) is calculated using:

`m = (y_2 - y_1)/(x_2 - x_1)`

`m = (100 - 228)/(4 - 0)`

`m = (-128)/(4)`

`m = -32`

The slope is -32