document.write( "Question 150377: x-3y=7
\n" ); document.write( "2x-5y=13
\n" ); document.write( "solve by substitution \n" ); document.write( "
Algebra.Com's Answer #110331 by ankor@dixie-net.com(22740)\"\" \"About 
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x - 3y = 7
\n" ); document.write( "x = 3y + 7
\n" ); document.write( ":
\n" ); document.write( "Substitute (3y+7) for x
\n" ); document.write( "2x - 5y = 13
\n" ); document.write( "2(3y+7) - 5y = 13
\n" ); document.write( "6y + 14 = 5y = 13
\n" ); document.write( "6y - 5y = 13 - 14
\n" ); document.write( "y = -1
\n" ); document.write( ":
\n" ); document.write( "Find x using the x = 3y + 7
\n" ); document.write( "x = 3(-1) + 7
\n" ); document.write( "x = -3 + 7
\n" ); document.write( "x = + 4
\n" ); document.write( ":
\n" ); document.write( "Check solutions in the 2nd equation:
\n" ); document.write( "2(4) - 5(-1) =
\n" ); document.write( "8 + 5 = 13 \n" ); document.write( "
\n" );