document.write( "Question 615604: z –y = 30
\n" ); document.write( "z + y = 32\r
\n" ); document.write( "\n" ); document.write( "Column A: 2 -or- Column B: Y\r
\n" ); document.write( "\n" ); document.write( "A. if the quantity in Column A is greater
\n" ); document.write( "B. if the quantity in Column B is greater
\n" ); document.write( "C. if the two quantities are equal
\n" ); document.write( "D. if it is impossible to determine which quantity is greater
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Algebra.Com's Answer #387264 by KMST(5328)\"\" \"About 
You can put this solution on YOUR website!
The system of equations
\n" ); document.write( "\"system%28z-y+=+30%2Cz+%2B+y+=+32%29\"
\n" ); document.write( "can be solved in many different ways.
\n" ); document.write( "Since the value of y is needed, you do not need a full solution.
\n" ); document.write( "You need to get a way to answer the question as quickly as possible.
\n" ); document.write( "I would multiply the first equation times (-1),
\n" ); document.write( "getting \"-z%2By=-30\" and I would add the second equation to that, getting
\n" ); document.write( "\"z%2By-z%2By=32-30\" --> \"2y=2\" --> \"highlight%28y=1%29\"
\n" ); document.write( "So, the quantity in column B is 1, and since the quantity in column A is 2,
\n" ); document.write( "the quantity in column A is greater.
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