4
3
13
14
Correct answer is B
When you have two lines, y1,y2, perpendicular to each other, the product of their slopes = -1.
3x+4y+6=0⟹4y=−6−3x
∴
\frac{\mathrm d y}{\mathrm d x} = \frac{-3}{4}
Also, 4x - by + 3 = 0 \implies by = 4x + 3
y = \frac{4}{b}x + \frac{3}{b}
\frac{\mathrm d y}{\mathrm d x} = \frac{4}{b}
\frac{-3}{4} \times \frac{4}{b} = -1 \implies \frac{4}{b} = \frac{4}{3}
b = 3
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