Tentukan persamaan garis yanv melalui titik c. D (-3,1) dan sejajar garis x+4y+5=0

Bab Persamaan Garis
Matematika SMP Kelas VIII

ax + by = c, sejajar, (p, q)
ax + by - (ap + bq) = 0

x + 4y + 5 = 0, sejajar, (-3, 1)
x + 4y - (1 . (-3) + 4 . 1) = 0
x + 4y - (-3 + 4) = 0
x + 4y - 1 = 0

x + 4y + 5 = 0
4y = -x - 5
y = -1/4 x - 5/4

m1 = m2 = -1/4 (karena sejajar)

melalui titik D(-3,1)

y - y1 = m2 (x - x1)
y - 1 = -1/4 (x - (-3))
y - 1 = -1/4 (x + 3)
y - 1 = -1/4 x - 3/4
y = -1/4 x - 3/4 + 1
y = -1/4 x - 3/4 + 4/4
y = -1/4 x + 1/4
---------------------- × 4
4y = -x + 1