Question

a) x + y = 8
x - y = 2​

Answer 1

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$\boxed{\begin{array}{l}\sf x+y=8 \end{array}}\\\boxed{\begin{array}{l}\sf x-y=2 \end{array}}$

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$\Box \ \ \boxed{\begin{array}{l}\sf x=8 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=2 \end{array}}\\\\\Box \ \ \boxed{\begin{array}{l}\sf 2x=10 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=\frac{10}{2} \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=5 \end{array}}$

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$\Box \ \ \boxed{\begin{array}{l}\sf x+y=8 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 5+y=8 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf y=8-5 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf y=3 \end{array}}$

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$\Box \ \ \boxed{\begin{array}{l}\sf x-y=2 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 5-y=2 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf -y=2-5 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf -y=-3 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf y=3 \end{array}}$

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Resposta correta;

$x=5\\e\\y=3$

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