Correct Answer: Option A

Explanation

Grad of 3y = 4x - 1
y = 4x/3 - 1/3
Grad = 4/3

Grad of Ky = x + 3
y = x/k + 3/4
Grad = 1/k

Since two lines are perpendicular,
1/k = -3/4
-3k = 4
k = -4/3

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