1. Graph information to Equation (going the other direction)
10-1 Ellipses
Graph information to Equation
(going the other direction)

2. Homework
Along with the book assignment I want you to do one other problem.
Using a calculator, find 4 points that fit the equation
You may NOT list the points (2,0) or (-2,0)

3. Lets just look at this standard form, the fumble, to see exactly what we need.
You need the center, a and b, right?
Does this change with a kickoff?
So, how can we be given this information?

4. Center You could be given The center Major Axis (MA) endpoints
Minor Axis (ma) endpoints
Foci
Why?

5. a You could be given Major Axis (MA) endpoints Major Axis Length
Foci and minor axis information
Why?

6. b You could be given Minor Axis (ma) endpoints Minor Axis Length
Foci and major axis information
Why?

7. Don’t forget!
You also need the orientation!! I would TRULY suggest always doing a quick little sketch to see the axes orientation.
A longer vertical axis is a
A longer horizontal axis is a
kickoff
fumble

8. Examples Center (1, 1); Focus (1, 3); Vertex (1, -9)
2. Foci (4,2) and (8, 2); MA endpoints (3, 2), (9, 2)
3. ma endpoints (3, 2), (9, 2); c = 3