Slope and Y-Intercept of the Line of Best Fit

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

• A

• B

• C

• D

Tags

CCSS.8.EE.B.5

Which of the following could be a possible line of best fit for the data?

• y = -5/2x + 20

• y = -x + 19

• y = x + 20

• y = 2/3x + 15

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

Tags

CCSS.8.EE.B.5

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

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

A scientist is studying the relationship between the amount of sunlight a plant receives (x) and its growth rate (y). He finds the equation of the line of best fit to be:

y = 0.59x - 21.912

What is the rate of growth of the plant for each unit increase in sunlight?

• 0.59

• 0.59x

• 21.912

• -21.912

Tags

CCSS.HSF.LE.B.5

the slope is -5/7, what does that mean?

• gain 5 hour of sleep for 7 cups of coffee

• lose 5 hours of sleep for 7 cups of coffee

• lose 7 cups of coffee for 5 hours of sleep

• lose 5 cups of coffee for 7 hours of sleep

Tags

CCSS.HSF.LE.B.5

A scientist is studying the rate of a chemical reaction. He plots a graph and finds the line of best fit to be:

y = -0.011x + 40.604

Here, 'y' represents the concentration of the product and 'x' represents time. What is the rate of the reaction (slope of the line of best fit)?

• 0.011

• -0.011

• -0.011x

• 40.604

Tags

CCSS.HSF.LE.B.5

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

The scatterplot shows data collected from 9 people about how much money they earned based on the hours they worked. Use 2 points on the line of best fit and find the slope.

Tags

CCSS.8.EE.B.5

Using your slope from the previous question, give the equation for the line of best fit in point-slope form (choose 1 of the 2 points you used to find the slope)