1. Use gauss-jordan elimination to solve the following systems

x - 2y + z = -6

2x - 3y = 7

-x + 3y - 3z =11

I got a finite solution for this one which was wrong so I'm redoing it. Is it suppose to be infinite?

Ok. so I got x-3z=4

y-2z=5

and 0=0

Now im stuck.

2. Determine the polynomial function whose graph passes through the points: (1,4), (2,0), (3,12)

This one i'm stuck on. Curve fitting?