The problem gives us two important pieces of information: the total number of copies and the total cost. We are asked to find two equations that model the situation.

Let's define the variables:

• $b$ = the number of black-and-white copies.
• $c$ = the number of color copies.

1. The total number of copies is 68:

This gives us the equation: $b + c = 68$

2. The total cost of the copies is $6.00. Each black-and-white copy costs $0.08, and each color copy costs $0.15:

This gives us the equation: $0.08b + 0.15c = 6.00$

Thus, the two correct equations representing the system are:

• $b + c = 68$
• $0.08b + 0.15c = 6.00$

These two equations can be solved to find $b$ and $c$.

Do you want the detailed steps to solve this system? Here are some questions to explore further:

1. How do you solve a system of linear equations using substitution?
2. How do you solve a system of linear equations using elimination?
3. What happens if the total number of copies changes but the prices remain the same?
4. How does the solution change if black-and-white copies are cheaper?
5. What if the cost of color copies is increased to $0.20?

Tip: When solving systems of equations, carefully check units and coefficients to ensure the equations correctly represent the situation.