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Farzan, Why not? It is mathematically logical and correct. You need to be careful that you don't multiply or divide by zero, but that isn't the case here.
But remember that the caveats still apply: neither x nor y is allowed to be zero. Given this, do you have a function or not? A function is a relationship in which each permitted value of x has a unique value of y corresponding to it. In other words, if x_{1} ≠ x_{2}, then ƒ(x_{1}) ≠ ƒ(x_{2}). Cheers,  


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