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**1. Homework Statement , and relevant equations**

How is A6 arrived at and *how* did they get the "Q" in A6?

## Homework Equations

*See above*

**3. The Attempt at a Solution**

Objective: Rid A1 of L. They simply substituted "C" in A2 into A1. But how did they get rid of the L? I don't quite get the algebraic manipulation...please help

Objective: Rid A1 of L. They simply substituted "C" in A2 into A1. But how did they get rid of the L? I don't quite get the algebraic manipulation...please help