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Google Classroom$\newline$Answer two questions about Systems $A$ and $B$ :$\newline$System $A$$\newline$$\left\{\begin{array}{l}x+3 y=-9 \\ 2 x+y=4\end{array} \quad\left\{\begin{array}{l}3 x+4 y=-9 \\ 2 x+y=4\end{array}\right.\right.$$\newline$$1$) How can we get System $B$ from System $A$ ?$\newline$Choese $1$ answer:$\newline$(A) Replace one equation with the sum/difference of both equations$\newline$Replace only the left-hand side of one equation with the sum/difference of the left-hand sides of both equations$\newline$(C) Replace one equation with a multiple of itself$\newline$(D) Replace one equation with a multiple of the other equation$\newline$$2$) Based on the previous answer, are the systems equivalent? In other words, do they have the same solution?$\newline$Choese $1$ answer:$\newline$(A) Yes$\newline$(D) No