Question

Find the slope of a line perpendicular to the foloowing line 4x + y = 7

Answer 1

When two lines are perpendicular to each other the product of their slope is -1.

i.e m₁ x m₂ = -1 

4x + y = 7 

y = -4x + 7

m₁ = -4

Slope of required line (m2) = `(-1)/("m"_1) = 1/4`