document.write( "Question 828349: Mike is 5 years less than three times as old as his sister. Next year he will be twice as old as she will be. How old is each? \n" ); document.write( "

Algebra.Com's Answer #499254 by TimothyLamb(4379) $\"\"$ $\"About$

You can put this solution on YOUR website!
---
\n" ); document.write( "x = Mike
\n" ); document.write( "y = sister
\n" ); document.write( "---
\n" ); document.write( "x = 3y - 5
\n" ); document.write( "x + 1 = 2(y + 1)
\n" ); document.write( "---
\n" ); document.write( "put the system of linear equations into standard form:
\n" ); document.write( "---
\n" ); document.write( "x - 3y = -5
\n" ); document.write( "x - 2y = 1
\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 = Mike = 13
\n" ); document.write( "y = sister = 6
\n" ); document.write( "---
\n" ); document.write( "system matrix
\n" ); document.write( "1 -3
\n" ); document.write( "1 -2
\n" ); document.write( "---
\n" ); document.write( "inverse of system matrix
\n" ); document.write( "-2 3
\n" ); document.write( "-1 1
\n" ); document.write( "---
\n" ); document.write( "determinant of system matrix = 1
\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" ); document.write( "

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