Write in point-slope form and slope-intercept form the equation of the line through each pair of points
1. (0,1) and (3,0)
2. (-3,-2) and (1,6)

3. through (1,-19) (-2,-7)
4. through (-4,7) (-6,-4)
5. through (20,8) (9,16)

write an equation for each line
6.through (-1,3) and parallel to y = 2x + 1
7. through (2,2) and perpendicular to y = -3/5x +2
8. through (-3,4) and vertical
9. through (4,1) and horizontal