The scatterplot shows the height, in centimeters, of 6 plants based on the amount of fertilizer, in grams, they received. A line of best fit is also shown.
Based on the line of best fit, which of the following best describes the meaning of the slope of the line?
The predicted height of a plant that received no fertilizer.
The predicted increase in plant height for each additional gram of fertilizer.
The maximum amount of fertilizer used for any plant.
The average height of all plants in the study.
