Ajay decides to research the relationship between the length in inches and the weight of a certain species of catfish. He measures the length and weight of a number of specimens he catches then throws back into the water. After plotting all his data, he draws a line of best fit. What does the slope of the line represent?

The slope of the line represents the rate of change in weight for each unit increase in length. In other words, it shows how much the weight of the catfish tends to change with an increase in length.