Respuesta :

mathmate
If the required plane is parallel to the plane 
Π : 5x+2y-z=-6
then they both have the normal vector <5,2,-1>

Given the required plane passes through the point (5,5,4), the new plane is defined by
5(x-5)+2(y-5)-1(z-4)=0
=>
plane: 5x+2y-z=31

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