Question -
Answer -
So the directionratios of the lines are
-3, 2p/7, 2 and -3p/7,1, -5
Now, as both the linesare at right angles,
So, a1a2 +b1b2 + c1c2 = 0
(-3) (-3p/7) + (2p/7)(1) + 2 (-5) = 0
9p/7 + 2p/7 – 10 = 0
(9p+2p)/7 = 10
11p/7 = 10
11p = 70
p = 70/11
∴ The value of p is70/11