document.write( "Question 823604: mckenna has 21 coins worth $2.50. some are nickels, some are dimes, and some are quarters. the number of dimes is five less than twice the number of nickels. how many nickels does she have? \n" ); document.write( "
Algebra.Com's Answer #495656 by TimothyLamb(4379)\"\" \"About 
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\n" ); document.write( "x + y + z = 21
\n" ); document.write( "5x + 10y + 25z = 250
\n" ); document.write( "y = 2x - 5
\n" ); document.write( "---
\n" ); document.write( "put the system of linear equations into standard form
\n" ); document.write( "---
\n" ); document.write( "x + y + z = 21
\n" ); document.write( "5x + 10y + 25z = 250
\n" ); document.write( "2x - y = 5
\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( "answer:
\n" ); document.write( "x= nickels = 7
\n" ); document.write( "y= dimes = 9
\n" ); document.write( "z= quarters = 5
\n" ); document.write( "---
\n" ); document.write( "Solve and graph linear equations:
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\n" ); document.write( "Solve systems of linear equations up to 6-equations 6-variables:
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