Over a 9-year period from 1990 to 1999, the value of a baseball card increased by $18. Let x represent the number of years after 1990. Then the value (#y#) of the card is given by the equation #y=2x+47#?
1 Answer
original price is $47
Explanation:
I'm not exactly sure what it is you're trying to find, but I can try and help!
if x is the number of years after 1990, and its over a 9 year period, then x must be equal to 9. Let's plug it in.
this means that after 9 years, the value is $65. since we know that the value has increased by $18 since 1990, we can find the original value by subtracting
this means that the original value in 1990 is $47
(or
Another way to find this is to look at the equation without doing any math.
using
This can also be graphed, which can help you find the price for any year
graph{2x+47 [-770, 747, -34.5, 157.6]}