Verifying Lines are Perpendicular

[odolwa99]

Just a quick question here. Have I done this correctly? Do I need to factor in the 3 from L?

Many thanks.

Homework Statement

Q. Verify that the lines L: x -2y + 3 = 0 & K: 2x + y = 0 are perpendicular.

Homework Equations

The Attempt at a Solution

x(x) + y(y) = 0 => 1(2) + (-2)(1) = 2 - 2 = 0.

 

[e^(i Pi)+1=0]

I have no idea what your solution is supposed to show, but verifying that two lines are perpendicular is easy. Just put them in y=mx+b form and compare them. If their slopes are opposite and reciprocal (2/3, -3/2 for example), then they are perpendicular.

 

[odolwa99]

Ok, thank you.