Find the equations for the following lines.
1. Slope = 3, y-intercept = -2
2. Slope - 1, through (2, 3).
3. Slope = 0, through (2, 3).
4. Vertical through (2, 3).
5. Through ( 1, 2) and ( 5, 6).
6. Through (1, 2) and (5, 2).
7. Through (1, 2) and (1, 4).