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A point P lies on the line joining A(1,2,3) and B(2,10,1) . If z -coordinate of P is 7 , what is the sum of other two coordinates?

Options

  1. A-15
  2. B-13
  3. C-11
  4. D-9

Correct answer

A. -15

Step-by-step solution

Let AP : BP = k : 17= k +3 k +1 k = -2 3 So ratio is 2: 3 externally. aligned & Now, x= 2 2-3 1 2-3 =-1 & y= 2 10-3 2 2-3 =-14 & x+y=-15 aligned

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