Question

7) Resolva as equações a seguir: (A) x + 4 = 9; (B) 5x − 3 = 2x + 9; (C) 3x − 9 = 54. *

10 pontos

Sua resposta


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Answer 1

(A)

$x + 4 = 9\\x = 9 -4\\x = 5$

(B)

$5x - 3 = 2x + 9\\5x - 2x = 9 + 3\\3x = 12\\x = \frac{12}{3}\\x = 4$

(C)

$3x - 9 = 54\\3x = 54 + 9\\3x = 63\\x = \frac{63}{3}\\x = 21$