Linear euations in DS

[mobenny]

Hi,

I was reading somewhere that in DS questions the statements need to contain equations that are linear and distinct. I understand the distinct aspect, but I am not sure about the linear part. Is it true that for a statement to be sufficient the equation must be linear (i.e. contain no variables raised to any power)?

Thanks,

Moses

[esledge]

A wise test-taker considers whether equations are linear and/or distinct (i.e. independent), but there is no rule on the GMAT that DS equations must be either. For example, this would be a "legal" GMAT question:

What is x?

(1) x^2 - 2x - 8 = 0

(2) 2x^2 = 4(x + 4)

The correct answer is E.