First slide
Equation of line in Straight lines
Question

If x1,x2,x3 and y1,y2,y3 are both in G.P. with the same common ratio, then the points x1,y1 x2,y2 and x3,y3

Easy
Solution

Let x2=x1r,x3=x1r2

y2=y1r,y3=y1r2

The given points lie on the line

x1yy1x=0 for all values of r.

 

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