1) y=x+1
=>xy=x(x+2)
not sufficient, as we do not know the value of x
2) y=x^2+1
=>xy=x(x^2+1)
not sufficient as x unknown
together, equating the 2 statements we get x+1=x^2+1
=>x^2-x=0
=>x(x-1)=0
x=0 or x=1
this will give two values for y and hence 2 values for xy
no definite value, so both together not sufficient
E
value of xy
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Source: Beat The GMAT — Data Sufficiency |
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scoobydooby
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