Tolong banget nomor 20 sama 21

20.
y - y1 = m(x-x1)
y - 3 = -2 (x - 4)
y - 3 = -2x + 8
y = -2x + 8 + 3
y = -2x + 11
y + 2x - 11 = 0 (A)

21.
mq = y/x
mq = -2/3
mq = 2/3 (karena condong kekanan maka gradien menjadi positif)

mq x mp = -1
mp = -3/2

y - y1 = m(x - x1)
y - 0 = -3/2(x - 3)
y = -3/2x + 9/2
2y = -3x + 9 (B)