Problem:Find the equation of the plane that passes through the line of intersection of the planes $\displaystyle x-y+2z+5=0$ and $\displaystyle 2x+3y-z-1=0$, and is perpendicular to the plane $\displaystyle x+2y-2z=0$.

Answer:

$\displaystyle 4x+y+3z+9=0$

Comments:I'm stuck on tis one big time. Please grant me you help.(Crying)