What the slope of a line of best fit means
The slope tells how much y changes when x increases by 1.
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A line of best fit for temperature (x) and ice creams sold (y) is y = 2x + 12. By how much does the predicted y change when x increases by 3?
Answer: 6
A line of best fit for age of a car (x) and its price (y) is y = 3x + 21. By how much does the predicted y change when x increases by 2?
Answer: 6
A line of best fit for age of a car (x) and its price (y) is y = 9x + 20. By how much does the predicted y change when x increases by 8?
Answer: 72
Tip: The slope tells how much y changes when x increases by 1.
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