SOLUTION: When bottles of water cost $.80 per bottle at softball games, 200 bottles were sold. When the price was raised to $1.00 per bottle, only 150 bottles were sold. Determine the number

Question 1062666: When bottles of water cost $.80 per bottle at softball games, 200 bottles were sold. When the price was raised to $1.00 per bottle, only 150 bottles were sold. Determine the number of bottles of water sold if the price was $.90 per bottle.

Found 2 solutions by josgarithmetic, josmiceli:
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
Find the line containing the two points, (0.8, 200), and (1, 150). What is y when x=0.9 ?

now let x=0.9 and find y.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
There is an inverse linear relation ( I assume ) between
price of bottles and number of bottles sold
You are given 2 points on the line:
( 200, .8 ) and
( 150, 1 )
----------------------
Let = number of bottles sold
Let = price/bottle for bottles sold
-------------------------------------------------
Use the point-slope formula

Multiply both sides by

Multiply both sides by

-----------------------------
If

175 bottles will be sold at $.90/bottle
-----------------------------------
check:
Does the equation go through ( 200, .8 ) ?

OK
Does the equation go through ( 150,1 ) ?

OK

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