SOLUTION: The average value of a certain type of automobile was $14,100 in 1994 and depreciated to $7020 in 1998. Let y be the average value of the automobile in the year x, where x = 0 repr

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: The average value of a certain type of automobile was $14,100 in 1994 and depreciated to $7020 in 1998. Let y be the average value of the automobile in the year x, where x = 0 repr      Log On


   

Question 1152234: The average value of a certain type of automobile was $14,100 in 1994 and depreciated to $7020 in 1998. Let y be the average value of the automobile in the year x, where x = 0 represents 1994. Write a linear equation that models the value of the automobile in terms of the year x.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Use the general point slope formula
+%28+y+-+7020+%29+%2F+%28+x+-+4+%29+=+%28+14100+-+7020+%29+%2F+%28+0+-+4+%29+
++%28+y+-+7020+%29+%2F+%28+x+-+4+%29+=+7080+%2F+%28-4%29+
++%28+y+-+7020+%29+%2F+%28+x+-+4+%29+=+-1770+
+y+-+7020+=+-1770x+%2B+7080+
+y+=+-1770x+%2B+14100+
-------------------------------
check answer:
( 4, 7020 )
+y+=+-1770x+%2B+14100+
+7020+=+-1770%2A4+%2B+14100+
+7020+=+-7080+%2B+14100+
+7020+=+7020+
OK