It seems like you're trying to define some variables, but the format needs a little clarification. Let me interpret your statement:

• Is $A = 10B$?
• Is $c = x$?

If so, the system you've described consists of:

1. $A = 10B$
2. $c = x$

Would you like to solve for a specific variable or perform any operations with these equations?

Let me know, and I can help you further. Also, here are some related questions to expand on this concept:

1. What is the value of $B$ if $A = 100$?
2. How do we solve for $x$ if additional conditions are provided?
3. Can we express $A$ in terms of $B$ if more relations are given?
4. What happens if we add a constraint between $A$ and $c$?
5. What if we need to find $B$ in terms of both $A$ and $x$?

Tip: When working with variables and equations, clarity in notation is key to understanding and solving the system effectively.