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Question

Find the equations to the straight lines passing through the pair of points (at1,at1) and (at2,at2).

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Solution

Line passing through points A(x1,y2),B(x2,y2) is given by

yy1=(y2y1x2x1)(xx1)

Equation of line joining (at1,at1) and (at2,at2) is

yat1=(at2at1)at2at1(xat1)t1yat1=(a(t1t2)t1t2)a(t2t1)(xat1)t1yat1=1t1t2(xat1)(t1ya)t2=(xat1)t1t2yat2=x+at1t1t2y+x=a(t1+t2)


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