Tentukan persamaan garis 1. A (-3,5) dengan m = -2 2. B (-3,-5) dengan m = 1/2 3. P (2,4) dengan m = 2/5 4. A (-2,4) dan B (3,-5)

1) y - y1 = m ( x - x1)
y - 5 = - 2 ( x + 3 )
y = - 2x - 6 + 5
y = - 2x - 1

2) y - y1 = m ( x - x1)
y + 5 = ½ ( x + 3 )
y = ½ x + 3/2 - 5 ( dikali 2)
2y = x + 3 - 10
2y - x = - 7

3) y - y1 = m ( x - x1)
y - 4 = 2/5 ( x - 2)
y = 2/5 x - 4/5 + 4 (dikali 4)
4y = 2x - 4 + 16
4y - 2x = 12

4) ( y - y1 ) / ( y2 - y1 ) = ( x - x1 ) / ( x2 - x1 )
( y - 4) / ( - 5 - 4 ) = ( x + 2 ) / ( 3 + 2)
( y - 4 ) / - 9 = ( x + 2) / 5
5 ( y - 4 ) = - 9 ( x + 2)
5y - 20 = - 9x - 18
5y + 9x = - 18 + 20
5y + 9x = 2