document.write( "Question 281490: Solve by elimination\r
\n" ); document.write( "\n" ); document.write( "How do I solve 4x-3y=39
\n" ); document.write( " -3x-4y=23\r
\n" ); document.write( "\n" ); document.write( "I have worked this problem over and over please solve this for me. \n" ); document.write( "
Algebra.Com's Answer #204489 by CharlesG2(834)\"\" \"About 
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\"Solve by elimination\r
\n" ); document.write( "\n" ); document.write( "How do I solve 4x-3y=39
\n" ); document.write( " -3x-4y=23\r
\n" ); document.write( "\n" ); document.write( "I have worked this problem over and over please solve this for me.\"\r
\n" ); document.write( "\n" ); document.write( " 4x - 3y = 39 (multiply by 3)
\n" ); document.write( "-3x - 4y = 23 (multiply by 4)\r
\n" ); document.write( "\n" ); document.write( " 12x - 9y = 117
\n" ); document.write( "-12x - 16y = 92 (add 1st to 2nd)\r
\n" ); document.write( "\n" ); document.write( " 12x - 9y = 117
\n" ); document.write( " 0x - 25y = 209 (solve this one for y)\r
\n" ); document.write( "\n" ); document.write( "y = 209/(-25) = -209/25 = -8 9/25 = -8.36\r
\n" ); document.write( "\n" ); document.write( "plug in this y into 1st equation and solve for x
\n" ); document.write( "4x - 3(-8.36) = 39
\n" ); document.write( "4x + 25.08 = 39
\n" ); document.write( "4x = 13.92
\n" ); document.write( "x = 3.48\r
\n" ); document.write( "\n" ); document.write( "-3x-4y=23 (plug x and y into this one to check)
\n" ); document.write( "-3(3.48) - 4(-8.36) =? 23
\n" ); document.write( "-10.44 + 33.44 = 23 (works)\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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