Equations for Normal Forces at A and B: F_A + F_B = 0d * F_A - b * F_B = 0

[WesTech]

1. Homework Statement
This isn't really a problem but an example in an online lecture. I'm trying to understand everything for when I get to harder questions but am having trouble understanding the "d/b" part of the equation.

Homework Equations

How does dividing d by b help solve for the normal forces acting at A and B? I apologize if my question is not phrased well enough.

The Attempt at a Solution

 

[BvU]

Hi Wes,

It's all about balance equations: The thing doesn't move (or keel over, which is also a form of motion), so

1. the forces balance
2. the moments balance

If you write down these two balance equations you have two equations for two unknowns (normal force at A and at B).

Do us a favor and write down these two equations and we'll take it from there (if still necessary )