SOLUTION: Joe's annual income has been increasing each year by the same dollar amount. The first year his income was $15,900, and the 9th year his income was 21,500. In which year was his in

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Question 1160539: Joe's annual income has been increasing each year by the same dollar amount. The first year his income was $15,900, and the 9th year his income was 21,500. In which year was his income 22,900?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
(1, $15,900)
(9, $21,500)
the slope, or the change in y/change in x, is $5600/8=$700 per year.
$22,900 is $1400 more than $21,500
$1400/$700=2 years
So it will be in the 11th year.