document.write( "Question 163890: 3x+7y-28=0\r
\n" ); document.write( "\n" ); document.write( "-x+12y-5=0 \n" ); document.write( "

Algebra.Com's Answer #120781 by alicealc(293) $\"\"$ $\"About$

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3x+7y-28=0\r
\n" ); document.write( "\n" ); document.write( "-x+12y-5=0
\n" ); document.write( "-> x = 12y - 5
\n" ); document.write( "substitute this to Equation 1:
\n" ); document.write( "3*(12y - 5) + 7y - 28 = 0
\n" ); document.write( "<=> 36y - 15 + 7y - 28 = 0
\n" ); document.write( "<=> 43y = 15 + 28
\n" ); document.write( "<=> 43y = 43
\n" ); document.write( "<=> y = 1\r
\n" ); document.write( "\n" ); document.write( "x = 12y - 5
\n" ); document.write( "<=> x = 12*1 - 5
\n" ); document.write( "<=> x = 12 - 5
\n" ); document.write( "<=> x = 7\r
\n" ); document.write( "\n" ); document.write( "so, x = 7 and y = 1 \n" ); document.write( "

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