tentukan persamaan garis yg melalui titik (0,-9) dan bergradien berikut. a. 7 b. -5/6 (lima per enam) c. 0 d. 6⅔

a.y-y1=m(x-x1)
   y+9=7(x-0)
   y+9=7x
    7x-y-9=0

b.(-5/6)
y-y1=m(x-x1)
y+9=-5/6(x-0)
6(y+9)=-5(x-0)
6y+54=-5x
5x+6y+54=0

c.0
y-y1=m(x-x1)
y+9=0(x-0)
y+9=0

d.6 2/3=6 x 2/3=12/3=4
y-y1=m(x-x1)
y+9=4(x-0)
y+9=4x
4x-y-9=0