Linear Equations and Lines of Best Fit

Point where the graph crosses the X-Axis

• X - Intercept

• Y - Intercept

• Zero

• Decay

Another word for X-Intercept

• Root

• Initial Value

• Slope

• Y-Intercept

If m = -3/4 and b = 9, what is the equation of the trend line in y= mx + b?

• 0 = -3/4 (9) +9

• y = -3/4 x + 9

• y = -3/4 x - 9

• y = 3/4 + 9

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

• y = -5/8x + 6

• y = 5/8x + 6

• y =-8/5x + 6

• y = 8/5x + 6

Tags

CCSS.8.EE.B.5

The graph above shows a line of best fit for data collected on the distance bicyclists have remaining in relation to the amount of time they have been riding.  What is the equation of the line of best fit?

• y = -25x + 170

• y = 25x + 170

• y = -(5/8) x + 170

• y = (5/8) x + 170

Tags

CCSS.8.EE.B.5

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books. Use the trend line given and write an equation.

• y = 0x +10

• y= 0.1x+10

• y= 10x +0

• y= 0.1x +0

Tags

CCSS.8.EE.B.5

Write an equation for the given trend line

• y= 0.4x

• y= 2.5x

• y= -0.4x

• y= -2.5x

Tags

CCSS.8.EE.B.5

Write an equation for the trend line

• y= 0.5x

• y= 2x

• y= -0.5x

• y= -2x

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

The form of a linear equations that is Ax + By = C.

• Standard form

• Point-Slope form

• Slope-Intercept form

• Literal Equation