tolong kak pakai caranya persamaan garis lurus

Bab Persamaan Garis
Matematika SMP Kelas VIII

y = mx + c

1] y = m (x - x1) + y1
      = 3 (x - 0) - 4
      = 3x - 4

Jadi, persamaan garisnya y = 3x - 4

2] m = -1 1/2
        = -3/2

    y - y1 = m (x - x1)
    y - 2 = (-3/2) . (x - 1)
    2 (y - 2) = -3 (x - 1)
   2y - 4 = -3x + 3
   3x + 2y = 3 + 4
   3x + 2y = 7

   2y = -3x + 7
    y = (-3/2) x + (7/2)

Jadi, persamaan garisnya y = (-3/2) x + (7/2)

3] y = m (x - x1) + y1
       = 4 (x - (-2)) + 1
       = 4 (x + 2) + 1
       = 4x + 8 + 1
       = 4x + 9

Jadi, persamaan garisnya y = 4x + 9