jika garis ax +6y + 7 = 0 sejajar dengan garis yg melalui titik (-1, 3) dan (2, 4), nilai 1/2a adalah...

Kelas 8 Matematika
Bab Persamaan Garis

ax + 6y + 7 = 0
m = -a/b
m = -a/6

Sejajar

m = (y2 - y1)/(x2 - x1)
-a/6 = (4 - 3)/(2 - (-1))
-a/6 = 1/3
a = -6/3
a = -2

1/2 . a
= 1/2 . (-2)
= -1