document.write( "Question 1176816: A jar contains $13.00 in quarters and dimes. If there are 100 coins in total, how many quarters are there in the jar? \n" ); document.write( "

Algebra.Com's Answer #804505 by mananth(16946) $\"\"$ $\"About$

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Quarters = x
\n" ); document.write( "Dimes = y\r
\n" ); document.write( "\n" ); document.write( "Number of coins\r
\n" ); document.write( "\n" ); document.write( "1.00 x + 1.00 y = 100.00\r
\n" ); document.write( "\n" ); document.write( "Amount
\n" ); document.write( "
\n" ); document.write( "25.00 x + 10.00 y = 1300.00
\n" ); document.write( "Eliminate y
\n" ); document.write( "multiply (1)by -10.00
\n" ); document.write( "Multiply (2) by 1.00
\n" ); document.write( "-10.00 x -10.00 y = -1000.00
\n" ); document.write( "25.00 x 10.00 y = 1300.00
\n" ); document.write( "Add the two equations
\n" ); document.write( "15.00 x = 300.00
\n" ); document.write( "/ 15.00
\n" ); document.write( "x = 20.00 - quarters
\n" ); document.write( "plug value of x in (1)
\n" ); document.write( "1.00 x + 1.00 y = 100.00
\n" ); document.write( "20.00 + 1.00 y = 100.00
\n" ); document.write( " 1.00 y = 80.00
\n" ); document.write( " y = 80.00 ---- Dimes
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