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Amy has $325 in 39 bills of $5 and $10 denominations. What is the

Amy has $325 in 39 bills of $5 and $10 denominations. What is the
    quantity of $5 bills that Amy has?

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Francisco E. | Francisco; Civil Engineering, Math., Science, Spanish, Computers.Francisco; Civil Engineering, Math., Sci...
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Here the equations that will be formed are:
X= number of $5 bills
Y= number of $ 10 bills
5X+10Y = 325
X+Y= 39
Multiply the second equation by -5
5X+10Y = 325
-5X -5Y = -195
Adding them up we obtain:
5y = 130
Y= 26 $10 Bills
and 13 $5 Bills