20.5 ft

19.25 ft

21.02 ft

18 ft.

hours spent studying and your test grade

number of shoes you own and the size of your feet

ice cream sales and number of sunburns

number of schools and a city's population

153

47.2

4.7

1.8

$y=-0.54x+19.80$

$y=0.96x-0.98$

$y=19.80x-0.54$

$y=0.54x-19.80$

 $r=-0.98$  ; the relationship between age and body mass has a strong negative correlation.

 $r=-0.98$  ; the relationship between age and body mass has a strong positive correlation.

 $r=0.98$  ; the relationship between age and body mass has a strong negative correlation.

 $r=0.98$  ; the relationship between age and body mass has a strong positive correlation.

15

-10

0

2/3

$y=8x+6$

$y=8x$

$y=8x-2$

$y=6x$

Lines a and b are parallel

Lines a and b are perpendicular

Lines a and b intersect but are not perpendicular

Lines a and b are the same line