document.write( "Question 723190: solve system by elimination
\n" ); document.write( "-4x+5y=1
\n" ); document.write( "4x-4y=-4
\n" ); document.write( " the correct answer is (-4,-3) I dont understand elimination method \n" ); document.write( "

Algebra.Com's Answer #443078 by MathLover1(20850) $\"\"$ $\"About$

You can put this solution on YOUR website!
\r
\n" ); document.write( "\n" ); document.write( " $\"-4x%2B5y=1\"$
\n" ); document.write( " $\"4x-4y=-4\"$
\n" ); document.write( "___________________add them, $\"-4x\"$ and $\"4x\"$ will cancel each other; so, we will eliminate variable $\"x\"$ and solve for $\"y\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"-4x%2B5y%2B4x-4y=1%2B%28-4%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"cross%28-4x%29%2B5y%2Bcross%284x%29-4y=1-4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"5y-4y=-3\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28y=-3%29\"$ \r
\n" ); document.write( "\n" ); document.write( "now go one of given equations, plug in $\"y\"$ value and solve for $\"x\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"4x-4%28-3%29=-4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"4x%2B12=-4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"4x=-4-12\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"4x=-16\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=-16%2F4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28x=-4%29\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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