document.write( "Question 113959: \r
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\n" ); document.write( "\n" ); document.write( "Solve the system by graphing.4x + 2y = 10\r
\n" ); document.write( "\n" ); document.write( "Solve the system by substitution. 3x – y = –7
\n" ); document.write( " x + y = –9\r
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Algebra.Com's Answer #82925 by checkley71(8403)\"\" \"About 
You can put this solution on YOUR website!
4X+2Y=10
\n" ); document.write( "2Y=-4X+10
\n" ); document.write( "Y=-4X/2+10/2
\n" ); document.write( "Y=-2X+5
\n" ); document.write( "\"+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+y+=+-2x+%2B5%29+\" (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = -2x +5).
\n" ); document.write( "----------------------------------------------------------------------
\n" ); document.write( "3X-Y=-7
\n" ); document.write( "X+Y=-9
\n" ); document.write( "----------- NOW ADD.
\n" ); document.write( "4X=-16
\n" ); document.write( "X=16/-4
\n" ); document.write( "X=-4 ANSWER.
\n" ); document.write( "3*-4-Y=-7
\n" ); document.write( "-12-Y=-7
\n" ); document.write( "-Y=-7+12
\n" ); document.write( "-Y=5
\n" ); document.write( "Y=-5 ANSWER.
\n" ); document.write( "PROOF
\n" ); document.write( "-4+(-5)=-9
\n" ); document.write( "-4-5=-9
\n" ); document.write( "-9=-9\r
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