The following scatter plot represents the number of vacation days employees reported based on the number of years employed at their company. A scatter plot with the x-axis labeled Years Employed and y-axis labeled Vacation Days. It contains 10 points that are modeled by f of x equals 2 x plus 2 point 8. The points generally go up quickly to the right.

The data is modeled by the function f(x)=2x+2.8.
What does 2.8 represent in the function?

When an employee is employed for 2.8 years, they can expect to have 0 vacation days.
When an employee starts their job, they can expect to have 2.8 vacation days.
For each year of employment, employees can expect to get 2.8 additional vacation days.
For every 2.8 years of employment, employees can expect to get 1 additional vacation day.