document.write( "Question 569897: I need your help solving this using the combination method
\n" ); document.write( "2-7x=9y
\n" ); document.write( "2y-4x=6
\n" ); document.write( "I have tried this
\n" ); document.write( "7x-9y=-2
\n" ); document.write( "4x-2y=6 but I don't know where or what I did wrong?
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Algebra.Com's Answer #367476 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
I think you means,\"solve this using the elimination method\"
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\n" ); document.write( "2 - 7x = 9y
\n" ); document.write( "2y -4x = 6
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\n" ); document.write( "Put both equations into standard form
\n" ); document.write( "-7x - 9y = -2
\n" ); document.write( "7x + 9y = 2; multiplied by -1:
\n" ); document.write( "and
\n" ); document.write( "2y - 4x = 6
\n" ); document.write( "-4x + 2y = 6
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\n" ); document.write( "multiply the 1st equation by 4, and the 2nd equation by 7, results
\n" ); document.write( "+28x + 36y = 8
\n" ); document.write( "-28x + 14y = 42
\n" ); document.write( "-----------------addition eliminates x, find y
\n" ); document.write( "0x + 50y = 50
\n" ); document.write( "y = 50/50
\n" ); document.write( "y = 1
\n" ); document.write( ":
\n" ); document.write( "Use the 1st original equation to find x, 2 - 7x = 9y
\n" ); document.write( "replace y with 1
\n" ); document.write( "2 - 7x = 9(1)
\n" ); document.write( "-7x = 9 - 2
\n" ); document.write( "-7x = 7
\n" ); document.write( "x = \"7%2F%28-7%29\"
\n" ); document.write( "x = -1
\n" ); document.write( ":
\n" ); document.write( "The solutions: x=-1, y=1
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\n" ); document.write( "You can check this in the 2nd original equation\r
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