A store owner buys a quantity of balls for $600. If they had each cost $0.25 less, she would have 10 more for the same money. How much did she pay for each ball.

(x-0.25)*(y+10)

is how far I got. Is this even a quadratic equation?

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- Apr 22nd 2010, 01:14 PMsinjid9Quadratic help
A store owner buys a quantity of balls for $600. If they had each cost $0.25 less, she would have 10 more for the same money. How much did she pay for each ball.

(x-0.25)*(y+10)

is how far I got. Is this even a quadratic equation? - Apr 22nd 2010, 02:15 PMArchie Meade
Hi sinjid9,

the amount of money is the same in both cases and is (price)(quantity).

Hence, if x=price, y=number of balls

Now write one variable in terms of the other using

This leads to the quadratic in a single variable.

For example....

as x has to be positive.

notice