Question

Resolva a) 2 x + 9 = 81 b) x + 3 = 5 c) 3z - 1 = 14 d) 10 - 4 y = y

Answer 1

Resposta:

$a)2x + 9 = 81 \\ 2x = 81 - 9 \\ 2x = 72 \\ x = \frac{72}{2} \\ x = 36 \\ \\ b) \: x + 3 = 5 \\ x = 5 - 3 \\ x = 2 \\ \\ c) \: 3z - 1 = 14 \\ 3z = 14 + 1 \\ 3z = 15 \\ z = \frac{15}{3} \\ z = 5 \\ \\ d) \: 10 - 4y = y \\ - 4y -y = - 10 \\ 4y + y = 10 \\ 5y = 10 \\ y = \frac{10}{5} \\ y = 2$

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