document.write( "Question 818588: [ Use substitution to solve the system of equations
\n" ); document.write( "2x-3y=21
\n" ); document.write( "y=3-x ] \n" ); document.write( "
Algebra.Com's Answer #492644 by TimothyLamb(4379)\"\" \"About 
You can put this solution on YOUR website!
2x - 3y = 21
\n" ); document.write( "y = 3 - x
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\n" ); document.write( "2x - 3y = 21
\n" ); document.write( "2x - 3(3 - x) = 21
\n" ); document.write( "2x - 9 + 3x = 21
\n" ); document.write( "5x = 30
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\n" ); document.write( "answer:
\n" ); document.write( "x = 6
\n" ); document.write( "y = -3
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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( "Convert fractions, decimals, and percents:
\n" ); document.write( "https://sooeet.com/math/fraction-decimal-percent.php
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\n" ); document.write( "Calculate and graph the linear regression of any data set:
\n" ); document.write( "https://sooeet.com/math/linear-regression.php \n" ); document.write( "
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