verify that the two planes are parallel x$-5$y$+2$z$=11,$ x$-5$y$+2$z$=3$ find the normal vector n$1$ to x$-5$y$+2$z$=11$ find the normal vector n$2$ to x$-5$y$+2$z$=3$ does there exsist a constant c such that n$2=$cn$1$ fidn the distance between the planes