Textbook Problem

Comparing Planes In Exercises 13-22, determine whether the planes

$a_{1}x+b_{1}y+c_{1}z=d_1$

and

$a_{2}x+b_{2}y+c_{2}z=d_2$ are parallel, perpendicular, or neither. The planes are parallel when there exists a nonzero constant k such that $a_1=k{a}_2,b_1=k{b}_2$, and $c_1=k{c}_2$, and are perpendicular when $a_1{a}_2+b_1{b}_2+c_1{c}_2=0.$

$x=-2,y=4$