Bunuel
In DS questions statement(s) is (are) sufficient only if we can get single numerical value of variable, midpoint coordinates, etc.
I know what you mean (solving in terms of a variable is rarely sufficient), but we have to be careful--this is not always true.
If the question being asked is a yes/no question ("is x positive?" or "is y less than 0?"), then the statements could be sufficient even if we can get multiple values for x or y, so long as they always result in the same answer to the question being asked (either "always yes", or "always no").
There are some cases on DS where both solving in terms of a variable, and getting multiple numerical values, can be sufficient.
For example, if the question asks, "is x > 5?" and statement #1 leads me to the conclusion that x = 10, 15, or 20, then I can conclude "sufficient," even though I found multiple solutions for x,
because the answer to the question being asked is always yes.
This can also be true when solving in terms of a variable. If the question asked "is x positive?" and I am able to solve for x as \((y^2+1)\), then I know that regardless of the value of y, x must be positive. Hence it would be sufficient.
Yes. This is a value question so I think it's clear what I meant: When a DS question asks about the value of some variable, then the statement(s) is sufficient ONLY if you can get the