Question

X + y=-4
X +2y=13
Using elimination method

Answer 1

`\begin{array}{lrlll} x+y=-4&* -1\implies &-x-y=4\\ x+2y=13&\implies &\ x+2y=13\\ &&\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\\ &&\boxed{?}+\boxed{?}=\boxed{?} \end{array}`