document.write( "Question 1031874: y = x2 - 5x - 4\r
\n" );
document.write( "\n" );
document.write( "y = -2x2 - 4x - 2\r
\n" );
document.write( "\n" );
document.write( "I have to solve these using substitution and it is due today. I don't understand these and if I don't get them then I don't graduate. :( \n" );
document.write( "
Algebra.Com's Answer #646561 by ankor@dixie-net.com(22740) You can put this solution on YOUR website! y = x^2 - 5x - 4 \n" ); document.write( "y = -2x^2 - 4x - 2 \n" ); document.write( "Substitute (x^2 - 5x - 4) for y in the 2nd equation \n" ); document.write( "x^2 - 5x - 4 = -2x^2 - 4x - 2 \n" ); document.write( "Combine like terms on the left \n" ); document.write( "x^2 + 2x^2 - 5x + 4x - 4 + 2 = 0 \n" ); document.write( "3x^2 - x - 2 = 0 \n" ); document.write( "you can use the quadratic formula but this will factor to \n" ); document.write( "(3x + 2)(x - 1) \n" ); document.write( "3x = -2 \n" ); document.write( "x = -2/3 \n" ); document.write( "and \n" ); document.write( "x = 1 \n" ); document.write( " |