nomor 3 sama caranya terimakasih

2y + 4x - 4 = 0
2y = -4x + 4
y = -2x + 2

m = -2

syarat tegak lurus
m1.m2 = -1
m2 = -1 / (-2)
m2 = 1/2

maka cari yg gradiennya 1/2

(i) 8x - 6y - 20 = 0
6y = 8x - 20
y = 4/3 x - 10/3
m = 4/3 (tidak memenuhi)

(ii) 3x - 6y - 18 =0
6y = 3x - 18
y = 1/2x - 3
m = 1/2 (memenuhi)

(iii) 2x - 4y - 12 = 0
4y = 2x - 12
y = 1/2x - 3
m = 1/2 (memenuhi)

jawaban C