Linear Equations and Line of Best Fit

Find the slope from the table.

• -4

• 1

• 4

• -2

What is the slope?

• -1/3

• -3

• -4

• 5

What is a line of best fit used for?

• To make predictions

• To make the graph look pretty

• To connect the points

• To make it look like you know what you are doing

A restaurant sells pizza for the prices in the data table.  Calculate the linear regression equation of the data.

• y = 1.5x + 12

• y = 12x + 1.5

• y = 0.67x - 8

• y = -8x + 0.67

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

What is the line of best fit?

• y = 5/3x + 375

• y = 1/3x + 475

• y = 5/3x + 3

• y = 1/3x + 375

The red line represents the line of best fit for the scatter plot. How many ice cream sales are expected if the temperature is 90°?

• 55

• 0

• 103

• 100

What type of association does this graph have?

• positive

• negative

• none

• all of the above

Select the statement that best describes the line.

• The line is the line of best fit.

• The line is NOT a line of best fit because it does not pass through two points.

• The line is NOT a line of best fit because it does not go through the middle of the data set.

• The line is NOT a line of best fit because it does not go through the origin.

In the equation y=3x-5, what is the value of the y-intercept?

• 3

• -5

• -3/5

• -2