Question

3. Determine x y tais que
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Answer 1

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$\begin{vmatrix}\sf{x+y}&\sf{2}\\\sf{3}&\sf{1}\end{vmatrix}=\begin{vmatrix}\sf{4}&\sf{x-y}\\\sf{3}&\sf{1}\end{vmatrix}$

$+\underline{\begin{cases}\sf{x+\diagup\!\!\!y=4}\\\sf{x-\diagup\!\!\!y=2}\end{cases}}$

$\sf{2x=6}\\\sf{x=\dfrac{6}{2}}\\\huge\boxed{\boxed{\boxed{\boxed{\sf{x=3}}}}}\\\sf{x+y=4}\\\sf{3+y=4}\\\sf{y=4-3}\\\huge\boxed{\boxed{\boxed{\boxed{\sf{y=1}}}}}$

$\huge\boxed{\boxed{\boxed{\boxed{\sf{s=\{3,1\}}}}}}$