document.write( "Question 719859: 3x+y=9
\n" ); document.write( "5x-y=7
\n" ); document.write( "Solve the system of equation by graphing\r
\n" ); document.write( "\n" ); document.write( "Im confused becasue how can they just pick numbers?? Please Help thanks! \n" ); document.write( "

Algebra.Com's Answer #441584 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+3x+%2B+y+=+9+\"$
\n" ); document.write( " $\"+5x+-+y+=+7+\"$
\n" ); document.write( "First put them both into the same form
\n" ); document.write( "(1) $\"+y+=+-3x+%2B+9+\"$
\n" ); document.write( "(2) $\"+y+=+5x+-+7+\"$
\n" ); document.write( "-----------------
\n" ); document.write( "The slope of (1) is $\"+-3+\"$
\n" ); document.write( "The slope of (2) is $\"+5+\"$
\n" ); document.write( "----------------------
\n" ); document.write( "The point where the lines intersect is
\n" ); document.write( "the solution of the equations
\n" ); document.write( "To find the solution:
\n" ); document.write( "Add the equations as they are given originally
\n" ); document.write( " $\"+3x+%2B+y+=+9+\"$
\n" ); document.write( " $\"+5x+-+y+=+7+\"$
\n" ); document.write( " $\"+8x+=+16+\"$
\n" ); document.write( " $\"+x+=+2+\"$
\n" ); document.write( "PLug this result back into either equation
\n" ); document.write( " $\"+3%2A2+%2B+y+=+9+\"$
\n" ); document.write( " $\"+y+=+9+-+6+\"$
\n" ); document.write( " $\"+y+=+3+\"$
\n" ); document.write( "------------
\n" ); document.write( "This tells me the intersection is at ( 2,3 )
\n" ); document.write( "Here's the graph:
\n" ); document.write( " $\"+graph%28+400%2C+400%2C+-5%2C+5%2C+-10%2C+10%2C+-3x+%2B+9%2C+5x+-+7+%29+\"$ \r
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