document.write( "Question 478435: Solve the system of equations by substitution.
\n" ); document.write( "3x − y = 12
\n" ); document.write( "2x − 2y = 20
\n" ); document.write( "(x, y) = \n" ); document.write( "

Algebra.Com's Answer #327800 by Tatiana_Stebko(1539) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"system%283x-y=12%2C+2x-2y=20%29\"$
\n" ); document.write( "From the first equation $\"-y=12-3x\"$ , or $\"y=-12%2B3x\"$ substitute into the second equation
\n" ); document.write( " $\"2x-2%28-12%2B3x%29=20\"$
\n" ); document.write( " $\"2x%2B24-6x=20\"$
\n" ); document.write( " $\"-4x=20-24\"$
\n" ); document.write( " $\"-4x=-4\"$
\n" ); document.write( " $\"x=1\"$
\n" ); document.write( "substitute $\"x=1\"$ into the first equation $\"y=-12%2B3%2A1\"$
\n" ); document.write( " $\"y=-9\"$
\n" ); document.write( "Answer (1,-9) \n" ); document.write( "

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