6. MULTIPLE CHOICE Consider the system of
   equations.
   .

To solve the system of equations, we can substitute the second equation into the first. From , we can express in terms of : . Now substitute into the first equation:

Simplifying this, we get:

Now, substitute back into :

Thus, the solution is .

The correct answer is © The solution to the system is (4, 6).

Solving systems of equations can often be tricky, but understanding the substitution method can simplify things. Always replace one variable first to make it easier to solve for the other. And remember, double-checking your answers is key!

For practical applications, solving systems of equations is used in everyday situations, like planning budgets or determining the best way to allocate resources in business. By mastering this skill, you could be on your way to becoming an efficient manager or financial planner, making your calculations sharper than ever!