SOLUTION: a coin purse contains 80 cents in nickles and dimes. If there are 12 coins in all,haw many dimes are in the coin purse? i have to use two variables and i am in prealgebra

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Question 453329: a coin purse contains 80 cents in nickles and dimes. If there are 12 coins in all,haw many dimes are in the coin purse?
i have to use two variables and i am in prealgebra
Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
Let = number of nickels
Let = number of dimes
given:
(1)
(2) (in cents)
--------------------
Multiply both sides of (1) by
and subtract from (2)
(2)
(1)


and, since
(1)
(1)

There are 4 dimes in the purse
check answer:
(2)
(2)
(2)

OK
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