Uva@90 wrote:Initially even I thought answer as A. But, later drawing the graph I came to know answer A is in-correct.
But, the actual problem is it consumes more time to draw the graph as given.
it shouldn't take more than ten or twenty seconds.
what are you drawing? why is it taking so long?
if you actually had to use a slope formula, then i can see how this might take a little longer. but, two things:
1/ it still shouldn't take longer than a minute or so,
2/ you should know what different slope values look like on a graph, without having to think about coordinate values. (for instance, a slope of +1 makes a 45º angle with the coordinate axes; this is something you should know
as a thing, without having to think about ∆y/∆x.
Since almost all the GMAT problems can be solved by more than one method is there any other way we would interpret the solution.
with "reflection" you're going to have to draw it, unless you've memorized what happens.
e.g., if you reflect a line with a slope of "m" across either axis, then you'll get a line with a slope of "-m".
i wouldn't be able to remember this fact -- i'd have to draw a picture and look at it -- but maybe you can.
in other words, the only "alternative" here would be to have advance knowledge of what happens to the slope when you reflect the line.
in general, i wouldn't recommend accumulating too much of that kind of memorized knowledge -- if you have too many facts bumping around in your head, it will become harder to develop any intuition about the situation.
Ron has been teaching various standardized tests for 20 years.
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