Find the equation of a parabola that passes through the points (-2,3), (-1,1) and (1,9). Any help would be great;so confused right now. Stuck on this for over a hour now!

- Jun 28th 2010, 06:06 PMdillysmommaFinding equation of parabola passing through three known points.
**Find the equation of a parabola that passes through the points (-2,3), (-1,1) and (1,9). Any help would be great;so confused right now. Stuck on this for over a hour now!**

- Jun 28th 2010, 06:25 PMpickslides
Well the equation of a parabola is

substitute your points in one at a time then solve remaining system of equations.

Here's a kicker.

Now you have a go. - Jun 28th 2010, 06:37 PMdillysmomma
okay ill try some more now. ty

- Jun 28th 2010, 07:25 PMChris11
If you substitute the values into the general quadratic equation, then you get a linear system, which you can solve with substitution methodes.