Given equation of plane is x+3y+13=0....(ii) Eqs. (i) and (ii) represent same plane. ∴4+4λ=0⇒λ=−1 Putting λ=−1 in Eq. (i), we get −x−3y−p−10=0 ⇒x+3y+p+10=0....(iii) Comparing the coefficient of x,y and z constants term for Eqs. (i) and (ii), we get p+10=13 ⇒p=3