Scatter Plots Practice Test

A scientist measured the amount of fertilizer applied to 11 plants and the resulting plant height after 6 weeks. The scatterplot shows fertilizer (grams) on the $x$-axis and height (centimeters) on the $y$-axis. A dashed line of best fit is included. What does the slope of the line of best fit represent in this context?

A botanist recorded the amount of fertilizer used (grams) and the plant height after 4 weeks (centimeters) for 10 plants. The scatterplot includes a solid line of best fit. Which statement best describes the relationship between fertilizer and height shown in the scatterplot?