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Question -

P (a, b) is the mid-point of a line segment between axes. Show that equation of the line is  



Answer -

Let AB be the line segment between the axes and let P (a, b) be its mid-point.
 
Let the coordinates of A and B be (0, y) and (x, 0) respectively.
Since P (a, b) is the mid-point of AB,
Thus, the respective coordinates of A and B are (0, 2b) and (2a, 0).
The equation of the line passing through points (0, 2b) and (2a, 0) is
On dividing both sides by ab, we obtain
 
Thus,the equation of the line is .


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