Vertical line

15.1 Outline

1. Solving equations with two variables
   1. satisfy an equation
   2. solution
2. Cartesian coordinate system
   1. definition
   2. axis, origin, quadrants
   3. coordinates
      1. abscissa
      2. ordinate
3. Graphing a line by plotting points
   1. graph of a line
   2. procedure
4. Graphing a line by slope-intercept
   1. standard form
   2. first-degree