document.write( "Question 828692: A rectangles length is 4 less than triple it's width. If the perimeter of the rectangle is 40, find the area of the rectangle. \n" ); document.write( "

Algebra.Com's Answer #499449 by TimothyLamb(4379) $\"\"$ $\"About$

You can put this solution on YOUR website!
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\n" ); document.write( "x = 3y - 4
\n" ); document.write( "2x + 2y = 40
\n" ); document.write( "---
\n" ); document.write( "put the system of linear equations into standard form:
\n" ); document.write( "---
\n" ); document.write( "x - 3y = -4
\n" ); document.write( "2x + 2y = 40
\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 = 14
\n" ); document.write( "y = 6
\n" ); document.write( "area = xy = 14*6 = 84 sq.units
\n" ); document.write( "---
\n" ); document.write( "system matrix
\n" ); document.write( "1 -3
\n" ); document.write( "2 2
\n" ); document.write( "---
\n" ); document.write( "inverse of system matrix
\n" ); document.write( "0.25 0.375
\n" ); document.write( "-0.25 0.125
\n" ); document.write( "---
\n" ); document.write( "determinant of system matrix = 8
\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( "

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