mohon jawabannya beserta caranya

mb = 4/3
ma = -3/4

Titik yg berpotongan (3,0)

Persamaan garis a
y-y1 = m(x-x1)
<=> y-0 = -3/4(x-3)
<=> y = -3/4x + 9/4
(Kali 4)
<=> 4y = -3x + 9
<=> 3x + 4y = 9 (D)