SOLUTION: The co ordinates of the end points of a line segment PQ are P(3,7) and Q(11,-6). Find the coordinates of the point R on the y-axis such that PR=QR

Algebra ->  Graphs -> SOLUTION: The co ordinates of the end points of a line segment PQ are P(3,7) and Q(11,-6). Find the coordinates of the point R on the y-axis such that PR=QR      Log On


   



Question 1060124: The co ordinates of the end points of a line segment PQ are P(3,7) and Q(11,-6). Find the coordinates of the point R on the y-axis such that PR=QR
Found 3 solutions by Fombitz, ikleyn, MathTherapy:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
So R would be the midpoint of PQ.
The midpoint is the average of the x and y values,
x%5Bm%5D=%283%2B11%29%2F2=14%2F2=7
y%5Bm%5D=%287-6%29%2F2=1%2F2
.
.
.
Q:(7,1%2F2)

Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
.
The co ordinates of the end points of a line segment PQ are P(3,7) and Q(11,-6). Find the coordinates of the point R on the y-axis such that PR=QR
~~~~~~~~~~~~~~~~~~~~~~

The points in the y-axis are {R = (0,y)}.

The distance from R to P is  sqrt%28%28-3%29%5E2++%2B+%28y-7%29%5E2%29 = sqrt%289+%2B+%28y-7%29%5E2%29.

The distance from R to Q is  sqrt%2811%5E2++%2B+%28y-%28-6%29%29%5E2%29 = sqrt%28121%2B%28y%2B6%29%5E2%29.


The condition  |PR| = |QR|  is

sqrt%289+%2B+%28y-7%29%5E2%29 = sqrt%28121%2B%28y%2B6%29%5E2%29.

Square both sides to get

9 + (y-7)^2 = 121+(y+6)^2.

9 + y^2 - 14y + 49 = 121 + y^2 + 12y + 36,

-99 = 26y.

y = -99%2F26.


Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!
The co ordinates of the end points of a line segment PQ are P(3,7) and Q(11,-6). Find the coordinates of the point R on the y-axis such that PR=QR
Fact: The given points are located in the 1st and 4th quadrants
Fact: The x-coordinate of R is 0
y coordinate, when found, is: -+99%2F26, so coordinates of R are: highlight_green%28matrix%281%2C4%2C+%22%280%22%2C+%22%2C%22%2C+-+99%2F26%2C+%22%29%22%29%29