document.write( "Question 821815: Robbie is four years older than his sister, Michela. seven years ago, Robbie was three times as old as his sister. How old is Michela now? \n" ); document.write( "
Algebra.Com's Answer #494442 by TimothyLamb(4379)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "x = y + 4
\n" ); document.write( "x - 7 = 3(y - 7)
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\n" ); document.write( "x = y + 4
\n" ); document.write( "x - 7 = 3y - 21
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\n" ); document.write( "put the system of linear equations into standard form
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\n" ); document.write( "x - y = 4
\n" ); document.write( "x - 3y = -14
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\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
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\n" ); document.write( "answer:
\n" ); document.write( "x= robbie = 13
\n" ); document.write( "y= michela = 9
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\n" ); document.write( "Solve and graph linear equations:
\n" ); document.write( "https://sooeet.com/math/linear-equation-solver.php
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\n" ); document.write( "Solve quadratic equations, quadratic formula:
\n" ); document.write( "https://sooeet.com/math/quadratic-formula-solver.php
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\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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