George Kittle was given 300 protein bars. He eats 4 of them every day. Write an equation that represents the situation if he has 90 protein bars left.

Part 1) The linear equation is

Part 2) if he has 90 protein bars left, then 52.5 days have passed

Step-by-step explanation:

we know that

The linear equation in slope intercept form is equal to

where

y is the number of protein bars left

x is the number of days

m is the slope or unit rate

b is the y-intercept or initial value

In this problem we have

The slope is equal to

----> is negative because is a decreasing function

substitute

 ---> linear equation that represent this situation

If he has 90 protein bars left

so

For y=90

substitute in the linear equation and solve for x

therefore

if he has 90 protein bars left, then 52.5 days have passed