Equation of plane through the line of intersection of planes in Cartesian form is

(1)

For the standard equation of planes,

So, putting in equation (1), we have

2x-y + λ(3z-y)=0

2x + (-1-λ)y + 3λz=0 (2)

Now as the plane is perpendicular the given plane,

For θ=90°, cos90°=0

(3)

On comparing with standard equations in Cartesian form,

Putting values in equation(3),

2.4 + (-1-λ).5 + 3λ.-3=0

8-5-5λ-9λ=0

-14λ=-3

Putting in equation(2)

28x-17y + 9z=0

So, required equation of plane is 28x-17y + 9z=0.