tolong jawab yaaa..

1a. y - y1 = m(x - x1)
y + 1 = 1/2 (x - 0)
y + 1 = 1/2x - 0
y = 1/2x - 1

1b. y - y1 =m(x - x1)
y - 3 = -1(x - 0)
y - 3 = -x + 0
y = -x + 3

2a. y - y1 =m(x - x1)
y - 9 = 3/5(x - 5)
y - 9 = 3/5x - 3
y = 3/5x - 3 + 9
y = 3/5x + 6

2b. y - y1 =m(x - x1)
y - 3 = -1/2(x - 6)
y - 3 = -1/2x + 3
y = -1/2x + 3 + 3
y = -1/2x + 6

3a. y - y1 x -x1
-------- = ----------
y2 - y1. x2-x1

y - 6 x - 2
--------- = ---------
-4 - 6. -1 - 2

y - 6. x - 2
--------- = --------
-10. -3

-3y + 18 = -10x + 20
-3y = -10x +20 - 18
-3y = -10x + 2

3b. y - y1 x - x1
-------- = --------
y2 - y1. x2 - x1

y - 3. x - 1
-------- = ------
-5 -3. 8 - 1

y - 3. x - 1
------- = --------
-8 7

7y - 21 = -8y + 8
7y = -8y + 8 +21
7y = -8y + 29

sekian,,maaf klo ada yg slh