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Points M(-5,2) and N(5,8) lie on the xy - plane. What is the midpoint

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Points M(-5,2) and N(5,8) lie on the xy - plane. What is the midpoint [#permalink]

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New post 19 Feb 2012, 09:29
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Points M(-5,2) and N(5,8) lie on the xy-plane. What is the midpoint of line segment MN?

A. (5,0)
B. (0,5)
C. (0, (136^(1/2))/2)
D. (3/2,0)
E. (1,5)
[Reveal] Spoiler: OA

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Re: Points M(-5,2) and N(5,8) lie on the xy - plane. What is the midpoint [#permalink]

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New post 19 Feb 2012, 09:37
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Points M(-5,2) and N(5,8) lie on the xy - plane. What is the midpoint of line segment MN?
A. (5,0)
B. (0,5)
C. (0, (136^(1/2))/2)
D. (3/2,0)
E. (1,5)

The midpoint of a segment is exactly halfway between its endpoints and it's location can be found using the Midpoint Theorem, which states:
• The x-coordinate of the midpoint is the average of the x-coordinates of the two endpoints.
• Likewise, the y-coordinate is the average of the y-coordinates of the endpoints.

So, x=(-5+5)/2=0 and y=(2+8)/2=5 --> coordinates of the midpoint are (0, 5).

Answer: B.

For more on this topic check Coordinate Geometry chapter of Math Book: math-coordinate-geometry-87652.html

Hope it helps.
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Re: Points M(-5,2) and N(5,8) lie on the xy - plane. What is the midpoint [#permalink]

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New post 19 Feb 2012, 09:47
Thanks a lot! My solution was too complicated!

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Re: Points M(-5,2) and N(5,8) lie on the xy - plane. What is the midpoint [#permalink]

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New post 21 Feb 2012, 03:58
+1 B

I think if u visualize it you can see that the mid-point of a line will be the center of the line however it may be aligned in the x-y plane. Thus (x1 + x2)/2 , (y1+ y2)/2 is the mid-point

I think in school we learnt this as the mid-point formula
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Re: Points M(-5,2) and N(5,8) lie on the xy - plane. What is the midpoint [#permalink]

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Re: Points M(-5,2) and N(5,8) lie on the xy - plane. What is the midpoint   [#permalink] 07 Oct 2017, 15:22
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