document.write( "Question 838390: substitution 5x+2y=7 -2x+2y=-14 \n" ); document.write( "

Algebra.Com's Answer #505583 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
1. $\"5x%2B2y=7\"$
\n" ); document.write( "2. $\"+-2x%2B2y=-14\"$
\n" ); document.write( "From eq. 1,
\n" ); document.write( " $\"2y=7-5x\"$
\n" ); document.write( "Substitute into eq. 2,
\n" ); document.write( " $\"-2x%2B7-5x=-14\"$
\n" ); document.write( " $\"-7x=-21\"$
\n" ); document.write( " $\"x=3\"$
\n" ); document.write( "Then,
\n" ); document.write( " $\"2y=7-5%283%29\"$
\n" ); document.write( " $\"2y=7-15\"$
\n" ); document.write( " $\"2y=-8\"$
\n" ); document.write( " $\"y=-4\"$
\n" ); document.write( " \n" ); document.write( "

\n" );