document.write( "Question 827713: solve for x in the two equations below using substitution
\n" ); document.write( "12x - 3y = 36
\n" ); document.write( "24x + 3y= 180 \n" ); document.write( "
Algebra.Com's Answer #498850 by richwmiller(17219)\"\" \"About 
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Substitution is the wrong method to use.
\n" ); document.write( "Addition or elimination is easier.
\n" ); document.write( "12x - 3y = 36
\n" ); document.write( "24x + 3y= 180
\n" ); document.write( "add
\n" ); document.write( "36x=216
\n" ); document.write( "x=6
\n" ); document.write( "substitution
\n" ); document.write( "12x - 3y = 36
\n" ); document.write( "12x-36=3y
\n" ); document.write( "24x + 3y= 180
\n" ); document.write( "3y=180-24x
\n" ); document.write( "12x-36=180-24x
\n" ); document.write( "36x-36=180
\n" ); document.write( "36(x-1)=180
\n" ); document.write( "x-1=5
\n" ); document.write( "x=6\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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