Determine whether the ordered pair is a solution of the system of linear equations.
-$\begin{array} { l }
( - 4 , - 5 ) ; \
\left\{ \begin{array} { l }
x + y = - 1 \
x - y = 9
\end{array} \right.
\end{array}$

Question

Determine whether the ordered pair is a solution of the system of linear equations.
-$\begin{array} { l } 
( - 4 , - 5 ) ; \
\left\{ \begin{array} { l } 
x + y = - 1 \
x - y = 9
\end{array} \right.
\end{array}$

Quizplus · Accepted Answer

Substituting $x = -4$ and $y = -5$ into both equations gives: For the first equation, $(-4) + (-5) = -9$, not $-1$; for the second equation, $(-4) - (-5) = 1$, not $9$. Thus, the ordered pair $(-4, -5)$ does not satisfy both equations simultaneously.

Determine Whether the Ordered Pair Is a Solution of the System