What is the slope of a trend line that passes through the points (1, 3) and (10, 25)?

22 / 9

Step-by-step explanation:

25 - 3 = 22

10 - 1 = 9

22 / 9

You cannot simplify 22 / 9

If you drop a ball from the top of a tall building, the height of the ball at time t seconds is not a linear function.

Example of linear function:
Salary is a good example of a linear function.
If you make 300 dollars a week, and let x be the number of weeks, the total money made is y = 300x.