SOLUTION: Please help!
Kelley has a total of $6 in dimes and quarters. If she has a total of 30 coins, how many quarters does she have? And I have to use it in substitution form an
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Question 699423: Please help!
Kelley has a total of $6 in dimes and quarters. If she has a total of 30 coins, how many quarters does she have? And I have to use it in substitution form and elimination form.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = number of dimes she has
Let = number of quarters she has
given:
(1)
(2) ( in cents )
----------------------
Using substitution,
(1)
(2)
(2)
(2)
(2)
and
(1)
(1)
(1)
She has 10 dimes and 20 quarters
------------------------------
You can do it by elimination, too
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)
OK
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