Question

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

Answer 1

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