Watch the linear video #1 and take notes. Please answer one of the following questions:

- Explain difference in slope of vertical and horizontal lines.
- Explain how to write a linear equation in slope intercept form from two points.
- Explain the difference in slope of parallel and perpendicular lines.
- Use the functions: y = -2x + 1 and y = 1/2x - 7. Are these lines parallel, perpendicular, or neither? Explain.