Question

Resolva o sistema X+y= 80 3x-y=32

Answer 1

$+\underline{\begin{cases}\mathsf{x+y=80}\\\mathsf{3x-y=32}\end{cases}}$

$\mathsf{4x=112}\\\mathsf{x=\dfrac{112}{4}}\\\huge\boxed{\boxed{\boxed{\boxed{\mathsf{x=28}}}}}\\\mathsf{28+y=80}\\\mathsf{y=80-28}\\\huge\boxed{\boxed{\boxed{\boxed{\mathsf{y=52}}}}}$

$\huge\boxed{\boxed{\boxed{\boxed{\mathsf{S=\{28,52\}}}}}}$

$\dotfill$

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