document.write( "Question 149355: What would X= And what would Y= if,\r
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document.write( "-2x - 3y = -3
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document.write( "and
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document.write( "4x + 5y = 3\r
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document.write( "I Dont understand how to do this, since you cant use substitution ( i dont think)
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document.write( "And you cant change the signs since they dont have anyn umbers that are alike.\r
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document.write( "Ive been stuck on this problem for 11minutes now. :-(\r
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document.write( "i Just need to know what X and Y equal.
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document.write( "And if you could show me How you do it so ill understand for another problem like this i might run into.\r
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document.write( "Thank you So much,
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document.write( "Keith. \n" );
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Algebra.Com's Answer #109570 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! -2x - 3y = -3 \n" ); document.write( "and \n" ); document.write( "4x + 5y = 3 \n" ); document.write( "--------------------- \n" ); document.write( "Multiply thru the 1st equation by 5. \n" ); document.write( "Multiply thru the 2nd equation by -3. \n" ); document.write( "---------------------------- \n" ); document.write( "-10x -15y = -15 \n" ); document.write( "-12x -15y = -9 \n" ); document.write( "--------------- \n" ); document.write( "Subtract the 2nd equation from the 1st to solve for \"x\": \n" ); document.write( "2x = -6 \n" ); document.write( "x = -3 \n" ); document.write( "------------ \n" ); document.write( "Substitute that into one of the original equations to solve for \"y\": \n" ); document.write( "-2*-3 -3y = -3 \n" ); document.write( "Divide thru by -3 to get: \n" ); document.write( "-2 +y = 1 \n" ); document.write( "y = 3 \n" ); document.write( "============== \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " \n" ); document.write( " |