Determine the equation of the plane that passes through points (1,0,-1), (0,2,3), and (0,0,0).

Letting the equation of the plane be ax+by+cz+d=0

Skipping through the steps...

$\displaystyle cx-\frac {3}{2}cy+cz=0$

$\displaystyle 2x-3y+2z=0$

How do you know c=2?