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

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Manager
Joined: 08 Apr 2004
Posts: 131
Location: Corea
two lines W,Z in xy plane, is the slope of W<=Z? 1)W [#permalink]

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20 Sep 2004, 22:50
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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
Joined: 05 May 2004
Posts: 574
Location: San Jose, CA
Re: DS: St line slope [#permalink]

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20 Sep 2004, 23:01
C

either one is insufficient as we dont have info about the other line
Senior Manager
Joined: 25 Dec 2003
Posts: 359
Location: India

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20 Sep 2004, 23:54
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
Joined: 05 May 2004
Posts: 574
Location: San Jose, CA

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21 Sep 2004, 00:28
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

I thought Infinity>0
Anyways I dont know how ETS handles this
OA will clarify my doubt
Director
Joined: 16 Jun 2004
Posts: 891

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21 Sep 2004, 22:30
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.
21 Sep 2004, 22:30
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