What the slope of a line of best fit means

The slope tells how much y changes when x increases by 1.

1. A line of best fit for temperature (x) and ice creams sold (y) is y = 5x + 9. By how much does the predicted y change when x increases by 7?
2. A line of best fit for shoe size (x) and height (y) is y = 2x + 26. By how much does the predicted y change when x increases by 2?
3. A line of best fit for temperature (x) and ice creams sold (y) is y = 2x + 9. By how much does the predicted y change when x increases by 7?
4. A line of best fit for age of a car (x) and its price (y) is y = 3x + 7. By how much does the predicted y change when x increases by 4?
5. A line of best fit for shoe size (x) and height (y) is y = 11x + 6. By how much does the predicted y change when x increases by 8?
6. A line of best fit for age of a car (x) and its price (y) is y = 7x + 27. By how much does the predicted y change when x increases by 7?
7. A line of best fit for shoe size (x) and height (y) is y = 5x + 15. By how much does the predicted y change when x increases by 3?
8. A line of best fit for temperature (x) and ice creams sold (y) is y = 8x + 35. By how much does the predicted y change when x increases by 4?
9. A line of best fit for age of a car (x) and its price (y) is y = 12x + 12. By how much does the predicted y change when x increases by 7?
10. A line of best fit for temperature (x) and ice creams sold (y) is y = 4x + 25. By how much does the predicted y change when x increases by 12?
11. A line of best fit for shoe size (x) and height (y) is y = 4x + 15. By how much does the predicted y change when x increases by 10?
12. A line of best fit for hours of sleep (x) and minutes to fall asleep (y) is y = 2x + 14. By how much does the predicted y change when x increases by 8?
13. A line of best fit for temperature (x) and ice creams sold (y) is y = 5x + 30. By how much does the predicted y change when x increases by 3?
14. A line of best fit for shoe size (x) and height (y) is y = 12x + 37. By how much does the predicted y change when x increases by 3?
15. A line of best fit for shoe size (x) and height (y) is y = 5x + 14. By how much does the predicted y change when x increases by 2?
16. A line of best fit for temperature (x) and ice creams sold (y) is y = 19x + 14. By how much does the predicted y change when x increases by 12?
17. A line of best fit for temperature (x) and ice creams sold (y) is y = 17x + 10. By how much does the predicted y change when x increases by 3?
18. A line of best fit for age of a car (x) and its price (y) is y = 18x + 20. By how much does the predicted y change when x increases by 18?
19. A line of best fit for hours studied (x) and test score (y) is y = 24x + 20. By how much does the predicted y change when x increases by 10?
20. A line of best fit for shoe size (x) and height (y) is y = 6x + 8. By how much does the predicted y change when x increases by 4?