21. The table below shows the average price of a personal computer during certain years.
year
price
1997
$1,950
1999
$1,719
2003
$1,420
2007
$1,175
2010
$949
2012
$725
a)
a) Write an equation to model the data using linear regression.
b)
b) Use the equation to predict the average cost of a
personal computer in 2020.
Gina Wilson (All Things Algebra)