Interpreting Line of Best Fit

Describe the association, if any, as linear or nonlinear.

• Linear

• Non-linear

• No Association

Which of the following is the equation of the line of best fit? Use points (40, 15) and (80, 30) to help you find the slope.

• y = 0. 625x + 0

• y = 0.375x + 10

• y = 0.52x + 0

• y = 0.375x + 0

Which of the following is the equation of the line of best fit? Use points (2, 6) and (4, 1) to help you find the slope.

• y = 2.5x + 11

• y = -2.5x + 11

• y = -3x + 10

• y = -2x + 11

The y-intercept of this line is 11. This means Mia will make about 11 mistakes if she practices for ______ hours.

• 0

• 1

• 2

• 3

The slope of this line is -2.5. This means Mia will make about ______ fewer mistakes each hour she practices.

• 1

• 2.5

• 2

• 5

• 3

The y-intercept of this line is 40. This means that if a student doesn't study, they will receive a 40.

• True

• False

The equation of this line of best fit is y = -75x + 4500.

Predict how many text messages a person who is 55 years old would send. (HINT: PLUG IN 55 for x into the equation)

• 375

• 400

• 425

• 450

What is the equation of the line of best fit shown? Use points (5, 250) and (50, 500) to help you find the slope.

• y = 2.57x + 225

• y = 3.25x + 225

• y = 0.5x + 225

• y = 5.56x + 225

What is the equation of the line of best fit shown? Use points (1, 40) and (4.5, 25) to help you find the slope.

• y = -5x + 44

• y = -4.29x + 44

• y = 4.29x + 44

• y = -0.5x + 44

The equation of the line of best fit shown is y = -4.29x + 44. Using this equation of the line of best fit, make a conjecture about the gas mileage of a car if it weighs 5.5 tons.

• 22. 22.2 mpg

• 24.8 mpg

• 18.6 mpg

• 20.4 mpg