# How do you write an equation for a circle passing through (-1,2), (3,4), and (2,-1)?

##### 1 Answer

Jul 27, 2016

#### Answer:

#### Explanation:

The circle's general equation is

This equation must be obeyed by the three points. Substituting

Those equations are easily handled taking the difference between the first and the second, and the first and the third, obtaining

Solving for