Question

Find the equation of the plane with normal (-5, -4, -1) which passes through (1, -4,-5).

Answer 1

Equation of the plane is

$\begin{gathered} -5(x-1)-4(y+4)-(z+5)=0 \\ -5x-4y-z-16=0 \\ 5x+4y+z+16=0 \end{gathered}$