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two lines W,Z in xy plane, is the slope of W<=Z? 1)W

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Manager
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two lines W,Z in xy plane, is the slope of W<=Z? 1)W [#permalink] New post 20 Sep 2004, 21:50
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A
B
C
D
E

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two lines W,Z in xy plane, is the slope of W<=Z?

1)W parallel x-axis

2)Z parallel y-axis
Director
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Re: DS: St line slope [#permalink] New post 20 Sep 2004, 22:01
C

either one is insufficient as we dont have info about the other line
Senior Manager
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 [#permalink] New post 20 Sep 2004, 22:54
1)W parallel x-axis - If parallel to X axis, then the slope cannot be determined (or it is undefined)

2)Z parallel y-axis - Then the slope is 0.

Hence we can say E (cannot be determined)
_________________

Giving another SHOT

Director
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 [#permalink] New post 20 Sep 2004, 23:28
carsen wrote:
1)W parallel x-axis - If parallel to X axis, then the slope cannot be determined (or it is undefined)

2)Z parallel y-axis - Then the slope is 0.

Hence we can say E (cannot be determined)


Carsen, long time no see :wink:

I see your point
I thought Infinity>0
Anyways I dont know how ETS handles this
OA will clarify my doubt
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 [#permalink] New post 21 Sep 2004, 21:30
Agree E.

A quick Note on Line parallel to a axis:
We know the equation of a line is ax+by+c=0 where c is a constant and the slope is (coeff of x/Co-eff of y).

y=c, a constant, is the equation of any line parallel to x axis (horizontal line) and x=c, a constant is the equation fo any line parallel to y axis (vertical line). The slope of ALL horizontal lines = 0 and the slope of ALL vertical lines is UNDEFINED.
  [#permalink] 21 Sep 2004, 21:30
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two lines W,Z in xy plane, is the slope of W<=Z? 1)W

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