Curve of Best Fit

When in doubt, plug everything into (a)   !!!!!

Tags

CCSS.8.EE.C.7B

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

When using Desmos to find the curve of best fit, what do I need to enter first?

• y₁ ~ ax₁² +bx₁ + c

• the equation

• the table/chart of values

• the vertex

Tags

CCSS.HSF-IF.C.7A

When finding the curve of best fit in Desmos, what do I do after I enter my table of coordinates?

• plot the points

• y₁ ~ ax₁ +b

• y₁ ~ ax₁² +bx₁ + c

• do a little dance

Using the curve of best fit, what would be the output (y) when the input (x) is 7? (Click the graph to enlarge it.)

• 260

• 240

• 140

• 320

Find the best fitting quadratic model for the data given. (Click on the chart to enlarge it.)

• y = 1.2x² + 13x + 504.3

• y = 12x² + 13x + 504.3

• y = .12x² + 1.3x + 504.3

Calculate the Curve of Best Fit for this table of values:

• y = 2x² - 9x + 10

• y = 3x² + 9x - 10

• y = 3.1x² - 9.2x - 10.3

• y = 2.1x² - 8.6x + 10.1

What would the equation be that best fits this data?:

{(-15, 53.5), (-14, 28), (-3, 18), (0, 4), (6, 27), (14, 50)}

• y = .17x²+.45x+12.43

• y = .16x²+.45x+12.42

• y = -.04x + 30

• y = -.03x + 30

The table shows the average braking distance of a car at various speeds.  Use a quadratic model to predict the breaking distance at 70mph.  (Click on the chart to enlarge it.)

• 245 ft
• 225 ft
• 285 ft
• 265 ft

In the equation

y = x² +5x +7, match each coefficient with its correct letter

• a=0, b=5, c=7

• a=1, b=5, c=7

• a=7, b=5, c=1