Question 818820
That asks,

"What is the equation of the line that comes the closest 
to passing through these 5 points? (The regression line) 

(4,4), (5,8), (6,9), (7,12), and (9,17) 

On your TI-83 or 84

press ON
press CLEAR
press STAT
press 1
         in L1 enter 4,5,6,7,9 and in L2 enter 4,8,9,12,17

press STAT
press the right arrow key once to highlight CALC
press 4
press ENTER

read

y=ax+b
a=2.5
b=-5.5
rē=.9840425532
r=.9919891901

Answer:  y=2.5x-5.5  The 5 points and the regression line are drawn below:

{{{drawing(400,8400/13,-2,11,-2,19, graph(400,8400/13,-2,11,-2,19), 
circle(4,4,0.15),circle(4,4,0.13),circle(4,4,0.11),circle(4,4,0.09),circle(4,4,0.07),circle(4,4,0.05),circle(4,4,0.03),circle(4,4,0.01),locate(4,4,"(4,4)"),

circle(5,8,0.15),circle(5,8,0.13),circle(5,8,0.11),circle(5,8,0.09),circle(5,8,0.07),circle(5,8,0.05),circle(5,8,0.03),circle(5,8,0.01), locate(5,8,"(5,8)"),

circle(7,12,0.15),circle(7,12,0.13),circle(7,12,0.11),circle(7,12,0.09),circle(7,12,0.07),circle(7,12,0.05),circle(7,12,0.03),circle(7,12,0.01), locate(7,12,"(7,12)"),

circle(6,9,0.15),circle(6,9,0.13),circle(6,9,0.11),circle(6,9,0.09),circle(6,9,0.07),circle(6,9,0.05),circle(6,9,0.03),circle(6,9,0.01), locate(6,9,"(6,9)"),

circle(9,17,0.15),circle(9,17,0.13),circle(9,17,0.11),circle(9,17,0.09),circle(9,17,0.07),circle(9,17,0.05),circle(9,17,0.03),circle(9,17,0.01), locate(9,17,"(9,17)"),

line(-9,-28,19,42) )}}}




Edwin</pre>