tolong bantu jawab soal no. 8 beserta caranya

Kelas 8 Matematika
Bab Persamaan Garis

ax + by = c, tegak lurus, (p, q)
bx - ay = bp - aq

y = -4x + 5
4x + y = 5, tegak lurus, (0, 0)
x - 4y = 1 . 0 - 4 . 0
x - 4y = 0