document.write( "Question 174572: Which numbers cannot be used in place of the variable in the rational expression:\r
\n" ); document.write( "\n" ); document.write( "2y + 1
\n" ); document.write( "y^2 – y - 6
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Algebra.Com's Answer #129623 by Mathtut(3670) $\"\"$ $\"About$

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if this is $\"%282y%2B1%29%2F%28y%5E2-y-6%29\"$ as I suspect it is......then the denominator cannot be zero.
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\n" ); document.write( "therefore set $\"y%5E2-y-6=0\"$ and solve
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\n" ); document.write( " $\"%28y-3%29%28y%2B2%29=0\"$
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\n" ); document.write( "y cannot be $\"system%28y=3%2Cy=-2%29\"$ \n" ); document.write( "

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