To make $c$ the subject of the formula $a = b - c$, follow these steps:

1. Start with the given equation: $a = b - c$

2. Add $c$ to both sides of the equation: $a + c = b$

3. Subtract $a$ from both sides: $c = b - a$

Thus, the formula with $c$ as the subject is: $c = b - a$

Would you like a detailed breakdown of each step or have further questions?

Related Questions:

1. How do you isolate variables in more complex equations?
2. What are examples of real-world problems that use similar formulas?
3. How can you check if a formula rearrangement is correct?
4. What happens if all variables in this formula are negative?
5. How can this equation be visualized on a graph?

Tip: Always verify rearranged formulas by substituting known values!