document.write( "Question 827554: Justin has some nickels and dimes. He has a total of 30 coins with a value of $1.45. How many of each type of coin does he have? \n" ); document.write( "

Algebra.Com's Answer #498746 by TimothyLamb(4379) $\"\"$ $\"About$

You can put this solution on YOUR website!
---
\n" ); document.write( "x = nickels
\n" ); document.write( "y = dimes
\n" ); document.write( "---
\n" ); document.write( "x + y = 30
\n" ); document.write( "5x + 10y = 145
\n" ); document.write( "---
\n" ); document.write( "copy and paste the above linear system in standard form into this matrix-method 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 = 31
\n" ); document.write( "y = dimes = -1
\n" ); document.write( "---
\n" ); document.write( "system matrix
\n" ); document.write( "1 1
\n" ); document.write( "5 10
\n" ); document.write( "---
\n" ); document.write( "inverse of system matrix
\n" ); document.write( "2 -0.2
\n" ); document.write( "-1 0.2
\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
\n" ); document.write( "---
\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 6-equations 6-variables:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php \n" ); document.write( "

\n" );