The slope of this line is 2/3. what does that represent?

Slope of a line represents the money billed per lesson length.

Step-by-step explanation:

Slope of a line defined as the the number that measures the steepness and it is usually denoted by m.

It is also states the gradient of a line or the change in variable of y to the change in variable of x.

As per the statement:

Slope of a line is 2/3.

Here x axis represents the lesson length in minute and y axis represents the money billed in dollars

Then;

Slope of a line represents the money billed per lesson length.