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. :(
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Algebra.Com's Answer #646561 by ankor@dixie-net.com(22740)\"\" \"About 
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
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