document.write( "Question 1199694: Hello,\r
\n" ); document.write( "\n" ); document.write( "I need help with this multiple choice question. Detailed working out would be greatly appreciated.\r
\n" ); document.write( "\n" ); document.write( "For the line y=x to be tangent to the curve with equation y=k/x-1\r
\n" ); document.write( "\n" ); document.write( "A. k=1
\n" ); document.write( "B. k>1
\n" ); document.write( "C. k>-1/4
\n" ); document.write( "D. k=-1/4
\n" ); document.write( "E. 4k+1<0\r
\n" ); document.write( "\n" ); document.write( "This is my working out so far:
\n" ); document.write( "Tangent: y=x
\n" ); document.write( "Curve: y=k/x-1\r
\n" ); document.write( "\n" ); document.write( "Appreciate your help.
\n" ); document.write( "

Algebra.Com's Answer #833660 by ikleyn(52781)\"\" \"About 
You can put this solution on YOUR website!
.\r
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\n" ); document.write( "\n" ); document.write( "Your formula   y = k/x-1   is   AMBIGOUS,   i.e. can be read in two different ways.\r
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\n" ); document.write( "\n" ); document.write( "One way to read it is   y = (k/x) - 1.\r
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\n" ); document.write( "\n" ); document.write( "Another way is   y = k/(x-1).\r
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\n" ); document.write( "\n" ); document.write( "Use parentheses in your formulas when you post to this forum
\n" ); document.write( "to show which part is the numerator and which is the denominator.\r
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