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## 15.4 Outline

- Introduction
- definition
- model

- Geometric definition of conic sections
- parabola
- focus
- directrix
- axis
- vertex

- ellipse
- foci
- major axis
- center
- minor axis

- circle
- center
- radius

- hyperbola
- transverse axis
- center
- conjugate axis

- Algebraic definition of conic sections
- general form
- first-degree equation

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## 15.1 Outline

- Solving equations with two variables
- satisfy an equation
- solution

- Cartesian coordinate system
- definition
- axis, origin, quadrants
- coordinates
- abscissa
- ordinate

- Graphing a line by plotting points
- graph of a line
- procedure

- Graphing a line by slope-intercept
- standard form
- first-degree

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