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Question

find the equation of plane passing through the line of intersection of the planes x+y+z=6 and 2x+3y=4z-5=0 and the point(1,1,1).

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Solution

The given equation of the planes are :x+y+z -6 = 0 ....1 and 2x+3y+4z-5 = 0 ....2Now, equation of the plane passing through the line of intersection of the planes 1 and 2 is given by : x+y+z -6+λ2x+3y+4z-5 = 01+2λx + 1+3λy+1+4λz + -6-5λ = 0 ....3Since 3 passes through 1,1,1, then it must satisfy it.Put x=y=z=1 in 3, we get1+2λ+1+3λ+1+4λ-6-5λ = 0λ = 34Now, putting the value of λ in 3, we get10x+13y+16z-39 = 0This is the required equation of the plane.

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