Question

Responda correto todas

Answer 1

Resposta:

j) x = 10

k) x = 12

l) x = 9

Explicação passo a passo:

j)

$-6x + 9 = -51 \\-6x = -51 - 9\\ -6x = -60 . (-1)\\ 6x = 60\\ x = \frac{60}{6} \\\\x = 10$

k)

$\frac{x}{2} + 5 = 11\\\\\frac{x}{2} + \frac{5}{1} = \frac{11}{1}\\\\\frac{x + 5 = 11}{2} \\\\\frac{x + 10 = 22}{2} \\\\x + 10 = 22 \\x = 22 - 10 \\x = 12$

l)

$\frac{x}{3} - 7 = -4 \\\\\frac{x}{3} - \frac{7}{1} = -\frac{4}{1}\\\\\frac{x -7 = -4 }{3} \\\\\frac{x - 21 = -12}{3} \\\\x - 21 = -12 \\x = -12 + 21 \\x = 9$