I'm having trouble solving this. I seem to be totally lost. If someone could just tell me the steps I need to take, I'm pretty sure I can work backwards to understand it.

Question: Determine the Cartestian equation of the plane that passes through the points (1, 4, 5) and (3, 2, 1) and is perpendicular to the plane 2x-y+z-1=0.

The answer is 3x+5y-1z-18=0

Thanks