Equation and Line of Best Fit

Write the equation of a line in slope intercept form.
m = 1/2
b = 6

• y = 1/2x + 6

• y = 6x + 1/2

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

Write the equation of a line in slope intercept form.
m = -2/3
b = -4

• y = -4x - 2/3

• y = -2/3x - 4

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

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

Tags

CCSS.8.EE.B.5

• 617.51 miles

• 621.09 miles

• 100 miles

• 0.19 miles

Tags

CCSS.HSF.LE.B.5

The graph shows a line of best fit for data collected on the amount of income earned by lawn companies in relation to the number of yards mowed.  What is the equation of the line of best fit?

• y = (3/2) x

• y = 30x

• y = 30x + 300

• y = (3/2)x + 300

Tags

CCSS.8.EE.B.5

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 (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

What is the best prediction for the number of candies in the jar when 30 students visit her?

• 90

• 180

• 135

• 150

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