Question

Find the value of a line perpendicular to the given line  x-4y = 8

Answer 1

When the lines are perpendicular to the product of their slopes is -1

i.e m₁ x m₂ = -1 

x - 4y = 8

4y = x - 8

y = `1/4"x" - 2`

m₁ = `1/4`

Required slope = `(-1)/"m"_1`= -4