tentukan persamaan garis yg melalui titik (0,-9) dan bergradien berikut! a. 7 b. 5/2 c. 0 d. 6 3/2

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

b)
y-y1 = m (x-x1)
y-(-9) = 5/2 (x-0)
y+9 = 5/2x-0
y = 5/2x-9

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

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

Maaf kalo ada yang salah