document.write( "Question 380909: 3x-2y=9
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document.write( "-6x+4y=1\r
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document.write( "I need to solve special systems. (& if it is infinitely many, only one, or none.\r
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document.write( "I tried to do substitution. Canceling out one variable I think the answer I got was x=6 and y=18. \r
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document.write( "I am not sure it is right. I look at it and it just seems to long compared to the other problems.
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document.write( "3x-2y=9
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document.write( "-3 -3
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document.write( "x-2y=3
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document.write( "-x+x-2y=3+x
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document.write( "-2y=3+x
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document.write( "+2 +2
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document.write( "y =6+x\r
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document.write( "3x+y=6
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document.write( "3x+(6+x)=6
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document.write( "4x+6 =6
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document.write( "4x+6-6=6-6
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document.write( "4x = 0\r
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document.write( "Now it does not come out the way I had on paper. I did something wrong. Please help.\r
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document.write( "Thank you. \n" );
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Algebra.Com's Answer #270301 by mananth(16946)![]() ![]() You can put this solution on YOUR website! 3x-2y=9...............1 \n" ); document.write( "-6x+4y=1..............2 \n" ); document.write( ".. \n" ); document.write( "you will see that 6x is a multiple of 3x. 3x*2=6x \n" ); document.write( "so you can eliminate x by multiplying (1) 2 and add it to (2) \n" ); document.write( "3x*2-2*2y=2*9 \n" ); document.write( "6x-4y=18. \n" ); document.write( "add this to (2) \n" ); document.write( "-6x+6x-4y+4y=18+1 \n" ); document.write( "0= 19 \n" ); document.write( ".. \n" ); document.write( "The system has no solution. As you will see from the grah below. The lines are parallel.\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( "..\r \n" ); document.write( "\n" ); document.write( "m.ananth@hotmail.ca \n" ); document.write( " \n" ); document.write( " |