1. The problem is to create a system of 3 equations. 2. A system of equations consists of multiple equations with multiple variables that we solve simultaneously. 3. Let's create a simple system with 3 equations and 3 variables $x$, $y$, and $z$: $$\begin{cases} 2x + y - z = 3 \\ x - y + 2z = 2 \\ 3x + 4y + z = 7 \end{cases}$$ 4. These equations can be solved using substitution, elimination, or matrix methods. 5. Each equation relates the variables differently, allowing us to find unique values for $x$, $y$, and $z$ that satisfy all three simultaneously. This is a valid system of 3 equations.