Draw a graph representing a real-world linear function and write an equation for the graph. describe verbally what the graph represents, including slope and y-intercept.

What the graph represents: How the normal force on an object influences the maximum static force of friction on it in a particular experiement.
What the slope represents: μ
What the y-intercept represents: That when there is no normal force, there will be no static force of friction. 

The answer is A.440