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If line A is parallel to line B, what is the slope of line B?

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Bunuel
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If line A is parallel to line B, what is the slope of line B? [#permalink] New post   29 Aug 2018, 03:58
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If line A is parallel to line B, what is the slope of line B?

(1) Line A is parallel to the x-axis.
(2) Line A is perpendicular to the line x = 3
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Re: If line A is parallel to line B, what is the slope of line B? [#permalink] New post   29 Aug 2018, 04:25
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Bunuel wrote:
If line A is parallel to line B, what is the slope of line B?

(1) Line A is parallel to the x-axis.
(2) Line A is perpendicular to the line x = 3
Answer is D

Slope is 0 in both cases
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Re: If line A is parallel to line B, what is the slope of line B? [#permalink] New post   29 Aug 2018, 04:41
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Bunuel wrote:
If line A is parallel to line B, what is the slope of line B?

(1) Line A is parallel to the x-axis.
(2) Line A is perpendicular to the line x = 3


As Line A is parallel to line B, slope of line A = slope of line B.

(1) Line A is parallel to the x-axis. -> slope of line A is 0 -> slope of line B is 0 -> Sufficient.
(2) Line A is perpendicular to the line x = 3. As line x=3 is perpendicular to the x-axis, line A is parallel to the x-axis. -> slope of line A is 0 -> slope of line B is 0 -> Sufficient.

Answer D.
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Re: If line A is parallel to line B, what is the slope of line B? [#permalink] New post   29 Aug 2018, 05:03
Bunuel wrote:
If line A is parallel to line B, what is the slope of line B?

(1) Line A is parallel to the x-axis.
(2) Line A is perpendicular to the line x = 3


This was a simple one.

Line A is parallel to line B.

Therefore, slope of line A = slope of line B

(1) Line A is parallel to x-axis > Line A is horizontal > Slope of A = Slope of B = 0 (SUFFICIENT)

(2)Line A is perpendicular to the line x = 3 > x = 3 is a vertical line and A being perpendicular to it, has to be a horizontal line > Slope of A = Slope of B = 0 (SUFFICIENT)

Answer: D
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Re: If line A is parallel to line B, what is the slope of line B? [#permalink] New post   24 Mar 2022, 19:20
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Re: If line A is parallel to line B, what is the slope of line B? [#permalink]
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