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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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## 11.7 Outline

- Definition of variables
- Classification of financial formulas
- simple interest formula
- compound interest formula
- future value problem
- present value problem
- ordinary annuity
- present value of an annuity
- sinking fund
- amortization

## 11.7 Essential Ideas

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