document.write( "Question 825611: Stefan has a collection of nickels, dimes, and quarters. in all, he has 24 coins. seven of the coins are quarters. the total value of the collection is $2.90. How many nickles and how many dimes does he have? \n" ); document.write( "
Algebra.Com's Answer #497436 by TimothyLamb(4379)\"\" \"About 
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\n" ); document.write( "x + y + z = 24
\n" ); document.write( "z = 7
\n" ); document.write( "5x + 10y + 25z = 290
\n" ); document.write( "---
\n" ); document.write( "copy and paste the above standard form linear equations in to this solver:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php
\n" ); document.write( "---
\n" ); document.write( "solution:
\n" ); document.write( "x nickels = 11
\n" ); document.write( "y dimes = 6
\n" ); document.write( "z quarters = 7
\n" ); document.write( "---
\n" ); document.write( "system matrix
\n" ); document.write( "1 1 1
\n" ); document.write( "0 0 1
\n" ); document.write( "5 10 25
\n" ); document.write( "---
\n" ); document.write( "inverse of system matrix
\n" ); document.write( "2 3 -0.2
\n" ); document.write( "-1 -4 0.2
\n" ); document.write( "0 1 0
\n" ); document.write( "---
\n" ); document.write( "determinant of system matrix = -5
\n" ); document.write( "---
\n" ); document.write( "Solve and graph linear equations:
\n" ); document.write( "https://sooeet.com/math/linear-equation-solver.php
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\n" ); document.write( "Solve quadratic equations, quadratic formula:
\n" ); document.write( "https://sooeet.com/math/quadratic-formula-solver.php
\n" ); document.write( "---
\n" ); document.write( "Solve systems of linear equations up to 4-equations 4-variables:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php \n" ); document.write( "
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