Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) lx + my = 1 is the equation of the chord PQ of `y^2` = 4x whose focus is S. If PS and QS meet the prabola again at R and T, respectively, then the slope of RT is – - Sarthaks eConnect

lx + my = 1 is the equation of the chord PQ of `y^2` = 4x whose focus is S. If PS and QS meet the prabola again at R and T, respectively, then the slope of RT is :–

lx + my = 1 is the equation of the chord PQ of `y^2` = 4x whose focus is S. If PS and QS meet the prabola again at R and T, respectively, then the slope of RT is :–

A.

`-1/m`

B.

`l/m`

C.

`2/m`

D.

None of these

Solution

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Taking P and Q as `t_1` and `t_2` , respectively. The equation to PQ is `–2x + y(t_1 + t_2 ) = 2t_1 t_2` Comparing with lx + my = 1, we get `t_1 + t_2 = -(2m)/l`