Question

6. Resolva as equações de 1° grau:

a) x + y = 5
x - y = 1​

Answer 1

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$+\underline{\begin{cases}\sf x+\diagup\!\!\!y=5\\\sf x-\diagup\!\!\!y=1\end{cases}}\\\sf 2x=6\\\sf x=\dfrac{6}{2}\\\huge\boxed{\boxed{\boxed{\boxed{\boxed{\sf x=3\checkmark}}}}}\\\sf x+y=5\\\sf 3+y=5\\\sf y=5-3\\\huge\boxed{\boxed{\boxed{\boxed{\sf y=2\checkmark}}}}$