Data Sufficiency (DS) | Re: If xy = z, what is the value of x ? (1) y = 2z (2) z < -1

If xy = z, what is the value of x ?

(1) y = 2z
x(2z) = z
=> 2x (z) = z
But we can't cancel z here as z might be equal to zero .
Not sufficient

(2) z < -1
Not sufficient

Combining 1 and 2 , we get
x = 1/2

Answer C

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