
Concept explainers
To find: The navigator’s position.

Answer to Problem 44WE
The position of navigator is (54,−54) .
Explanation of Solution
Given information:
Two radio beacons are located at (−1,0) and (2,−1) .
The slope of line joining first and second radio beacon with navigator is -5 and 3 respectively.
Formula used:
Slope of line joining two points (x1,y1) and (x2,y2) is y2−y1x2−x1 .
Let the location of navigator be (x,y)
Slope of line joining radio beacon at (−1,0) and navigator is -5.
Recall that Slope of line joining two points (x1,y1) and (x2,y2) is y2−y1x2−x1 .
Slope of line joining radio beacon at (−1,0) and navigator will be:
y−0x−(−1)=−5yx+1=−5y=−5(x+1)y=−5x+5........(1)
Slope of line joining radio beacon at (2,−1) and navigator is 3.
Recall that Slope of line joining two points (x1,y1) and (x2,y2) is y2−y1x2−x1 .
Slope of line joining radio beacon at (2,−1) and navigator will be:
y−(−1)x−2=3y+1x−2=3y+1=3(x−2)y+1=3x−6
y=3x−5.....(2)
Putting value of y from equation 1 to equation 2,
−5x+5=3x−55+5=3x+5x10=8xx=54
Putting value of x in equation 2,
y=3(54)−5y=154−5y=15−204y=−54
The position of navigator is (54,−54) .
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