Which is the most appropriate equation for the line of best fit for the following graph?

A. y = 3.3x + 25
Correct! (13, 68) and (19, 88) are points near the line of best fit.

B. y = 3.2x + 18.5
Incorrect. Too low. Use Y= and table to see points are too low.

C. y = 3.4x + 28
Incorrect. Too high. Use Y= and table to see points are too high.

D. y = 5x
Incorrect. This line does not follow the same path as the data.

Which is the most appropriate equation for the line of best fit for the following graph?

A. y = 4.5x
Incorrect. This line does not follow the same path as the data.

B. y = 1.5x + 43
Incorrect. Too low. Use Y= and table to see points are too low.

C. y = 1.5x + 57
Incorrect. Too high. Use Y= and table to see points are too high.

D. y = 1.4x + 51
Correct! (6, 60) and (16, 75) are points near the line of best fit.

Which is the most appropriate equation for the line of best fit for the following graph?

A. y = 30x – 75
Incorrect. This line does not follow the same path as the data.

B. y = 12.5x – 22
Correct! (3.1, 16.5) and (3.3, 19) are near the line of best fit.

C. y = 12x – 16
Incorrect. Too high. Use Y= and table to see points are too high.

D. y = 3.5x + 7.3
Incorrect. This line does not follow the same path as the data.

The equation for the line of best fit for data comparing TAKS scores (y-value) and grade given in the student’s math class (x-value) is given by y = 11.4x + 1346. Using this equation what would be the best prediction for the TAKS score of a student that received an 80 in math class?

A. 2226
Incorrect. Did you check the table on your calculator?

B. 2100
Incorrect. Did you check the table on your calculator?

C. 2258
Correct! If you made an 80 (x value) in class, you would be predicted to make a 2258 (y value) on your TAKS test.

D. 2400
Incorrect. Did you check the table on your calculator?

The equation for the line of best fit for data comparing TAKS scores (y-value) and grade given in the student’s math class (x-value) is given by y = 11.4x + 1346. Using this equation what would be the best prediction for the grade needed in math class to receive a 2400 on TAKS?

A. 70
Incorrect. Did you check the table on your calculator?

B. 90
Incorrect. Did you check the table on your calculator?

C. 92
Correct! If you received a 2400 (y value) on TAKS, it was predicted that you would make a 92 (x value) in class.

D. 105
Incorrect. Did you check the table on your calculator?