Hint: To be collinear, show that : AB t
SP SQ
यदि P र Q दुई बिन्दुहरू हुन् जसका निर्देशाङ्कहरू क्रमशः (ark, 2at) र (1) र S बिन्दु (a, 0) भए
( 4 )
बाट मुक्त छ भनी देखाउनुहोस् ।
IP and Q are two points whose co-ordinates are (at', 2at) and (a/t^2 , 2a/t)
respectively and S is the point
(a,0). Show that(1/SP +1/SQ)
SO
is independent of t.
ANSWERS

As the points are collinear, the slope of the line joining

any two points, should be same as the slope of the line joining two other

points.

Slope of the line passing through points (x

1

,y

1

) and (x

2

,y

2

) =

x

2

−x

1

y

2

−y

1

So, slope of the line joining (p,0),(0,q)= Slope of the line joining

(0,q) and (1,1)

0−p

q−0

=

1−0

1−q

−

p

q

=1−q

Dividing both sides by q,

−

p

1

=

q

1

−1

=>

p

1

+

q

1

=1

answer is 1 hope this helps you helps so like this