document.write( "Question 694896: Using substitution.
\n" ); document.write( "X=3y
\n" ); document.write( "3x-5y=12 \n" ); document.write( "

Algebra.Com's Answer #428242 by Simnepi(216) $\"\"$ $\"About$

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x = 3y this is equation 1
\n" ); document.write( "3x - 5y = 12 this is equation 2
\n" ); document.write( "so putting equation 1 into equation 2 gives
\n" ); document.write( "3 X 3y - 5y = 12
\n" ); document.write( "simplifying gives
\n" ); document.write( "9y - 5y = 12
\n" ); document.write( "so
\n" ); document.write( "4y = 12
\n" ); document.write( "therefore
\n" ); document.write( "y = 3
\n" ); document.write( "substitute this into equation 1
\n" ); document.write( "x = 3 X 3
\n" ); document.write( "so
\n" ); document.write( "x = 9 \n" ); document.write( "

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