The function y = 5x has a rate of change that is in between the equation y = 4x and y = 6x.
In an equation, the rate of change is also called the slope. It is the amount that a number is increasing by. We put that value in front of the x in most equations.
In the equal that I gave, the 5 is in between the rates of 4 and 6.
(14)(6)=84 (base)(height)
I'm guessing you'd combine them. And the end equation would be
81x6y
Here, I am not sure, try this.