How to do this on my Prime ?

[ggauny@live.fr]

Hi,

I am learn how to calculate a fonction of parabole with 3 points given.
Me I do at hand pincil and paper, after I have resolve I obtain a system of 3 equations what I resolve with app linear solver. But I have to calculation by hand
the system as I say.

On internet I have see on a computer hand I dont' know the name a solution automatic, which I have tryied on Prime but no work. May be is a way to do same ?


In attachement I give what I do with hand and the other picture, may be you help me to do with Prime. Because I know how to do with hand ,it save me time for excercizes further if there is a solution automatic with Prime.

I hope it is clear because it is difficult for me to speek american.