Hi sikhman,
The GMAT Quant section is NOT a typical "math test" because you will have 5 answers to choose from and sometimes an important "hint" or pattern about the question can be deduced from the 5 choices. If you don't pay attention to the 5 answers (or in this case, don't post them), then you will likely force yourself into using a "math" approach, which might not be the most efficient/easiest way to solve the problem.
As an example, in this this question, we know that we need a line that is:
1) Perpendicular to 3x + 4y = 7
2) Passes through the point (3, -3)
That second fact is interesting in that we COULD plug in x = 3, y = -3 into the five options. If THAT solution doesn't fit any of those 5 answers, then those answers can be eliminated. Most GMAT Quant questions are designed with multiple approaches in mind; it's a way to test how flexible a thinker you are. So, in the future, you should post the 5 answers and consider what they offer you (in terms of options and information) - you might just discover a faster alternative to doing math.
GMAT assassins aren't born, they're made,
Rich