Given the equation:

$2x + y = 5$

To find the value of $4x$, we first need to express $y$ in terms of $x$. However, the equation does not provide a direct relationship between $x$ and $y$, meaning without additional information (such as another equation), the values of $x$ and $y$ cannot be individually determined.

But if you are only asked for $4x$ without needing $y$, we need to assume additional constraints (e.g., $y = 0$) to solve it. Otherwise, multiple solutions exist.

Would you like more details, or clarification on any point?

5 Related Questions:

1. How can we solve a system of two linear equations?
2. What are the possible solutions when one equation is given with two variables?
3. Can this equation be graphed on a coordinate plane?
4. How does substitution work in solving simultaneous equations?
5. What happens if we assume specific values for $y$?

Tip: Always check if you need more than one equation to find unique values for multiple variables.