Slope and Intercept Line of Best Fit

Suppose data related to the AVERAGE Temperature outside (T) and the number of winter Coats (C) sold at a store is collected and graphed.

The LINE OF BEST FIT has the equation C = -3T + 150.

Use this equation to predict the number of coats sold when the average temperature outside is 20°.

• 40

• 75

• 90

• 115

Suppose a LINE OF BEST FIT passes through the points (4, 8) and (6, 2). The Y-INTERCEPT of this line is . . .? (hint: find the equation in point-slope form first and then put it into slope-intercept form)

• 11

• 4

• 9

• 20

Suppose a LINE OF BEST FIT passes through the points (6, 34) and (8, 50). The EQUATION of this line is . . .? (hint: find the slope and the equation in point-slope form. THEN put it into slope-intercept form)

• y = 8x – 5

• y = 2x

• y = 2x + 7

• y = 8x – 14

Suppose a LINE OF BEST FIT passes through the points (4, 8) and (6, 2). The SLOPE of this line is . . .?

• -3

• -6

• 4

• 2

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

• 3

• -5

• -3/5

• -2

In the equation of the line of best fit, the m stands for?

• the slope

• the y-intercept

• the x-intercept

• the strength of the data points

The equation of the line of best fit of a scatter plot is y = 12x + 7. What is the slope of the equation?

• 12

• -12

• -7

• 7

The equation of the line of best fit of a scatter plot is y = −4x − 6. What is the the y-intercept?

• 6

• 4

• -4

• -6

The equation of the line of best fit of a scatter plot is
y = –4x – 6. What is the the y-intercept?

• -4x

• 6

• -6

• -10

The equation of the line of best fit of a scatter plot is y = 6x − 9. What is the slope of the equation?

• -6

• -9

• 6

• 9