Is the ordered pair $(4, -1)$ a solution to the system of equations $$\begin{cases} 2x + y = 7 \\ x - y = -1 \end{cases}$$?

No, because it does not satisfy the second equation.

No, because it does not satisfy the first equation.

Yes, because it satisfies the first equation.

Yes, because it satisfies both equations.

Why is the ordered pair $(1, 1)$ not a solution to the system of equations $$\begin{cases} 4x - y = 3 \\ x + y = 1 \end{cases}$$?

It does not satisfy the equation $4x - y = 3$.

It does not satisfy the equation $x + y = 1$.

It does not satisfy either equation.

A solution must contain a zero.