document.write( "Question 420142: Solve the system of equations by substitution.
\n" ); document.write( "3x + y = 13
\n" ); document.write( "2x - 7y = 24
\n" ); document.write( "
\n" ); document.write( "

Algebra.Com's Answer #293632 by robertb(5830)\"\" \"About 
You can put this solution on YOUR website!
From the top equation, y = 13 - 3x. Then\r
\n" ); document.write( "\n" ); document.write( "2x - 7(13 - 3x) = 24
\n" ); document.write( "==> 2x - 91 + 21x = 24
\n" ); document.write( "==> 23x = 115
\n" ); document.write( "==> x = 5.
\n" ); document.write( "==> y = 13 - 3*5 = 13 - 15 = -2.
\n" ); document.write( "
\n" );