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26 Dec 2009, 17:11
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
61% (01:33) correct
39%
(01:31)
wrong
based on 424
sessions
History
Date
Time
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Not Attempted Yet
The distance from the X-axis to point P is half the distance from the y-axis to point P. if the coordinates of P are (x,-7), how many units is P from the y-axis?
A. 3.5
B. 7
C. 9.8
D. 10.5
E. 14
A. 3.5
B. 7
C. 9.8
D. 10.5
E. 14
26 Dec 2009, 17:25
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tania
Couple of things: when we talk about the distance from the point to the line (any line including x and y-axis), the distance means the shortest distance, which is the length of the perpendicular from the point to the given line.
Back to the question. The point x has the coordinates (x,-7), which means that it's somewhere on the line y=-7. Hence the distance from this point to the X-axis is 7 units.
As the distance from the point to X-axis is half of the distance from it to the Y-axis, then the distance from it to the Y-axis is 7*2=14.
Answer: E.
Hope it's clear.
General Discussion
26 Dec 2009, 23:58
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P=(x,-7)
---> dis from pt. P to x axis=7 units
& dis from pt P to Y axis =x units
as per Q
The distance from the X-axis to point P = half the distance from the y-axis to point P
--->7=1/2*(x)
or x=7*2=14 units
---> dis from pt. P to x axis=7 units
& dis from pt P to Y axis =x units
as per Q
The distance from the X-axis to point P = half the distance from the y-axis to point P
--->7=1/2*(x)
or x=7*2=14 units
