slopes

[zuckerman]

IMO the real GMAT will likely use different terminology - such as 'intersect' as opposed to 'cross'. This is just my theory.
'Intersect' does seem to have a different connotation.

pareshpandit, I beg to differ on one point (no pun intended!). Generally speaking, I agree that a line cannot cross itself. But read on...

Mathematically (or EXAMatically) speaking, we can have two equations and call them line A and line B. Let's say that the equations represent the same straight line. We don't know this till we actually inspect the coefficients/offsets. If the coefficients/offsets turn out to be identical/proportional, only THEN can we say that lines A and B represent the same geometric straight line. And then they do intersect at infnite points... as it has been reduced to the 'trivial' case of two separately denoted equations representing the same straight line. The physical representation may be the same, but the lines are initially presented separately: as A and B. Do they cross in the traditional sense? Maybe yes, maybe no. Do they intersect? Yes they do... at infinite points.
Any comments/criticism is welcome...
For the exam, I'd go by what the OG says... I confess to not having the OG, so I will defer to anyone who is referring to it. It will help if we have the OA for questions such as these. Hopefully we won't have such agonizing choices to make on the real GMAT... then again maybe we will!!
Just my 2 cents.