document.write( "Question 682249: Find values for m and b in the following system so that the solution to the system is (–4, 5). mx + 5y = 21 and –4x – 4y = b \n" ); document.write( "

Algebra.Com's Answer #423112 by MathLover1(20850) $\"\"$ $\"About$

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( $\"x\"$ , $\"+y\"$ )= ( $\"-4\"$ , $\"+5\"$ )\r
\n" ); document.write( "\n" ); document.write( " $\"mx+%2B+5y+=+21\"$ .......eq. 1 and \r
\n" ); document.write( "\n" ); document.write( " $\"-4x-4y=b\"$ ....eq. 2\r
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\n" ); document.write( "\n" ); document.write( " $\"mx+%2B+5y+=+21\"$ .......eq. 1..plug in $\"x=-4\"$ and $\"+y=5\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"m%2A%28-4%29+%2B+5%2A5+=+21\"$ .......solve for $\"m\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"-4m+%2B25+=+21\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"-21+%2B25+=4m\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"4=4m\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28m=1%29\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"-4x-4y=b\"$ .....plug in $\"x=-4\"$ and $\"+y=5\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"-4%28-4%29-4%2A5=b\"$ ......solve for $\"b\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"16-20=b\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28-4=b%29\"$ \r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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