document.write( "Question 1155559: Solving:\r
\n" ); document.write( "\n" ); document.write( " 5 x-3y = 18
\n" ); document.write( " -3 x-3y = -12 \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Using Substitution Method.\r
\n" ); document.write( "\n" ); document.write( "Expressing x as a function of y (from the first equation) x = (18 +3y)/5\r
\n" ); document.write( "\n" ); document.write( "Substituting this expression into the second equation:\r
\n" ); document.write( "\n" ); document.write( " -3 (18 -3y)/5-3y = -12 \r
\n" ); document.write( "\n" ); document.write( "Why is this not -3(18+3y)/5-3y = -12 ?
\n" ); document.write( "
\n" ); document.write( "

Algebra.Com's Answer #778165 by Alan3354(69443)\"\" \"About 
You can put this solution on YOUR website!
5 x-3y = 18
\n" ); document.write( "-3 x-3y = -12
\n" ); document.write( "=================
\n" ); document.write( "Substitution is not a good choice here, tho you might be instructed to use it.
\n" ); document.write( "====
\n" ); document.write( "If you mean:
\n" ); document.write( "5x -3y = 18
\n" ); document.write( "-3x-3y = -12
\n" ); document.write( "---------------------- Subtract
\n" ); document.write( "8x = 30
\n" ); document.write( "x = 15/4
\n" ); document.write( "-----
\n" ); document.write( "Sub for x in either equation and find y.
\n" ); document.write( "-3 x-3y = -12
\n" ); document.write( "x + y = 4
\n" ); document.write( "y = 4 - 15/4
\n" ); document.write( "y = 1/4
\n" ); document.write( "
\n" );