document.write( "Question 232888: 9x+3y= -39
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document.write( " -9x+y = 71\r
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document.write( "y= 71+9x\r
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document.write( "9x+3(71+9x)= -39\r
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document.write( "9x+213+27x = -39\r
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document.write( "x= ?\r
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document.write( "I know that the coefficient of x is 18 but then I forget how to solve for x\r
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Algebra.Com's Answer #171992 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! 9x+3y= -39 \n" ); document.write( "-9x+y = 71 \n" ); document.write( "y= 71+9x \n" ); document.write( "9x+3(71+9x)= -39 \n" ); document.write( "9x+213+27x = -39 \n" ); document.write( "---------------- \n" ); document.write( "36x + 213 = -39 \n" ); document.write( "36x = -252 \n" ); document.write( "x = -7 \n" ); document.write( "------- \n" ); document.write( "y = 71+9x = 71 - 63 \n" ); document.write( "y = 8 \n" ); document.write( "--------- \n" ); document.write( "*************** \n" ); document.write( "Elimination would have been easier for this one, since the coefficients of x are the same. \n" ); document.write( " 9x+3y= -39 \n" ); document.write( "-9x+y = 71 \n" ); document.write( "-------------- \n" ); document.write( "0x + 4y = 32 \n" ); document.write( "y = 8 \n" ); document.write( "----- etc \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " |