document.write( "Question 325978: Solve by Substitution method
\n" ); document.write( "9m+n=32
\n" ); document.write( "m-3n=16 \n" ); document.write( "

Algebra.Com's Answer #233342 by mananth(16946) $\"\"$ $\"About$

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9m+n=32...........1
\n" ); document.write( "m-3n=16...........2
\n" ); document.write( "..
\n" ); document.write( "multiply equation by 3 and it to equation 2
\n" ); document.write( "3(9m+n)+(m-3n)=32*3+16
\n" ); document.write( "27m+3n+m-3n=96+16
\n" ); document.write( "28m=112
\n" ); document.write( "divide by 28
\n" ); document.write( "28m/28=112/28
\n" ); document.write( "m=4
\n" ); document.write( "..
\n" ); document.write( "plug the value of m in the equation 2
\n" ); document.write( "4-3n=16
\n" ); document.write( "Add -4 on both sides
\n" ); document.write( "4-4-3n=16-4
\n" ); document.write( "-3n=12
\n" ); document.write( "divide by -3
\n" ); document.write( "-3n/-3 = 12/-3
\n" ); document.write( "n=-4 \n" ); document.write( "

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