Question #202766

please solve ASAP. :(


Find the equation of the plane which passes through the line of intersection of the planes x+y−2z = 1 and 2x+y−4z = 3 and which is perpendicular to the plane x+y+z = 1


1
Expert's answer
2021-06-30T09:18:40-0400

x+y2z1=0  and  2x+y4z3=0x+y-2z-1=0\ \ and\ \ 2x+y-4z-3=0


Equation of plane passing through the line of intersection of the above two planes is

(x+y2z1)+λ(2x+y4z3)=0x(1+2λ)+y(1+λ)+z(24λ)13λ=0(x+y-2z-1)+\lambda(2x+y-4z-3)=0\\\therefore x(1+2\lambda)+y(1+\lambda)+z(-2-4\lambda)-1-3\lambda=0


This plane is perpendicular to x+y+z1=0x+y+z-1=0     \implies Normals are also perpendicular

Direction ratios of normals of new plane a1,b1,c1a_1,b_1,c_1 are (1+2λ),(1+λ),(24λ)(1+2\lambda),(1+\lambda),(-2-4\lambda) respectively

Direction ratios of normals of plane x+y+z-1=0 a2,b2,c2a_2,b_2,c_2 are 1,1,1are\ 1,1,1 respectively


Since the planes are perpendicular,

So, a1a2+b1b2+c1c2=0a_1a_2+b_1b_2+c_1c_2=0

1+2λ+1+λ24λ=0\therefore 1+2\lambda+1+\lambda-2-4\lambda=0

λ=\therefore -\lambda= 0     λ=0\implies \lambda=0


Substituting \lambda=0\ in equation of line , we get

    x+y2z1=0\implies x+y-2z-1=0

This is the required equation of line.


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