2. which of these is the point-slope form of the line through points (3,-1) and (4,9)?
1. y - 4 = 10(x -9)
2. y + 1 = 10(x - 3)
3. y - 3 = 10(x + 1)
4. y + 1 = 10(* - 4)
3. which of these is the point-slope form of the line through point (4,-2), with a slope of 7?
1. y - 4 = 7(x + 2)
2. y + 4 = 7(x - 2)
3. y + 2 = 7(x-4)
4. y - 2 = 7(x + 4)