document.write( "Question 825602: there are 250 students in the freshman class. the number of girls is 20 fewer than twice the number of boys. how many boys and girls are there in a class? \n" ); document.write( "

Algebra.Com's Answer #497428 by TimothyLamb(4379) $\"\"$ $\"About$

You can put this solution on YOUR website!
---
\n" ); document.write( "x = boys
\n" ); document.write( "y = girls
\n" ); document.write( "---
\n" ); document.write( "x + y = 250
\n" ); document.write( "y = 2x - 20
\n" ); document.write( "---
\n" ); document.write( "put the system of linear equations into standard form
\n" ); document.write( "---
\n" ); document.write( "x + y = 250
\n" ); document.write( "2x - y = 20
\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 = boys = 90
\n" ); document.write( "y = girls = 160
\n" ); document.write( "---
\n" ); document.write( "system matrix
\n" ); document.write( "1 1
\n" ); document.write( "2 -1
\n" ); document.write( "---
\n" ); document.write( "inverse of system matrix
\n" ); document.write( "0.33333333 0.33333333
\n" ); document.write( "0.66666667 -0.33333333
\n" ); document.write( "---
\n" ); document.write( "determinant of system matrix = -3
\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 4-equations 4-variables:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php \n" ); document.write( "

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