best equation: line of best fit from table of data

[REGINA]

have data as follows:

Code:
x 2 3 6 7 9
y 5 6 6 6 6

How do I find the equation of the line of best fit?

 

[stapel]

Please see the recent thread on this exercise.

Thank you.

Eliz.

 

[dede]

I did it you didn't help them either.