hey guys...i was just wondering if you could help me with these questions...

like..ok vector equation of a plane that is paralell to 3x-9y+z-12=0 and goes thru the pt 3 -7 1.

x,y,z= (3 -7 1) + s( ) + t( 3,1,0)

how...do u find s?...

and also if you had 3 pts...a, b, c...u would have to find ab..and ac...and cross product them...to find the normal rite?...then use a as ur pt...and how would u find the other directional vector for that?..

thankssss <3