document.write( "Question 943657: the sum of sally's age plus three times tomas age is 21. the difference of sally's age and tomas is 5. write and solve a system of equation \n" ); document.write( "
Algebra.Com's Answer #575347 by TimothyLamb(4379)\"\" \"About 
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x = sally age
\n" ); document.write( "y = tomas age
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\n" ); document.write( "x + 3y = 21
\n" ); document.write( "x - y = 5
\n" ); document.write( "---
\n" ); document.write( "put the system of linear equations into standard form
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\n" ); document.write( "x + 3y = 21
\n" ); document.write( "x - y = 5
\n" ); document.write( "---
\n" ); document.write( "copy and paste the above standard form linear equations in to this solver:
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\n" ); document.write( "solution:
\n" ); document.write( "x = 9
\n" ); document.write( "y = 4
\n" ); document.write( "---
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