document.write( "Question 1141608: Translate the axes to eliminate the first degree terms of
\n" ); document.write( "\"3x%5E2%2Bxy%2By%5E2-16x-10y%2B30=0\" Thank you.
\n" ); document.write( "

Algebra.Com's Answer #762254 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
\"3x%5E2%2Bxy%2By%5E2-16x-10y%2B30=0\"\r\n" );
document.write( "\r\n" );
document.write( "We replace x by (x+h) and y by (y+k)\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "There is no need to multiply everything out yet, so we just list \r\n" );
document.write( "the first degree terms:\r\n" );
document.write( "\r\n" );
document.write( "\"6hx%2Bkx%2Bhy%2B2ky-16x-10y\"\r\n" );
document.write( "\r\n" );
document.write( "Group the x terms and the y-terms and factor out x and y:\r\n" );
document.write( "\r\n" );
document.write( "\"%286h%2Bk-16%29x%2B%28k%2B2k-10%29y\"\r\n" );
document.write( "\r\n" );
document.write( "The first degree terms will vanish (become 0) if the coefficients of x and y\r\n" );
document.write( "are both 0.  So we set them equal 0:\r\n" );
document.write( "\r\n" );
document.write( "\"system%286h%2Bk-16=0%2Ch%2B2k-10=0%29\" \r\n" );
document.write( "\r\n" );
document.write( "We solve that system by elimination or substitution\r\n" );
document.write( "and get h=2, k=4\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\"3%28x%5E2%2B4x%2B4%29%2B%28xy%2B4x%2B2y%2B8%29%2B%28y%5E2%2B8y%2B16%29-16x-32-10y-40%2B30=0\"\r\n" );
document.write( "\r\n" );
document.write( "\"3x%5E2%2B12x%2B12%2Bxy%2B4x%2B2y%2B8%2By%5E2%2B8y%2B16-16x-32-10y-40%2B30=0\"\r\n" );
document.write( "\r\n" );
document.write( "That simplifies to\r\n" );
document.write( "\r\n" );
document.write( "\"3x%5E2+%2B+xy+%2B+y%5E2+-+6+=+0\"\r\n" );
document.write( "\r\n" );
document.write( "So we shift the graph 2 units left and 4 units down and that \r\n" );
document.write( "will eliminate the first degree terms, leaving only terms of\r\n" );
document.write( "degrees 0 and 2.\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );