Question

Resolva as equações. a) x - 17 = - 9 b) 3 (x + 2) + 5 = x + 12 c) 2x = - 7 d) x + 4 (x - 1) = 9 – 2 (x+3) e) 3x + 2 = 2x - 11 f) 5 (3x - 2) = 2 (6x + 3) g) 2x = 16 h) 2 (3x - 1) + 2 (3 - x) = 0 i)x/2=- 5 j) 7 (x -1) = 2 (3x +1) k) 2x + 14 = 5x - 1 l) 2 (3 - y) + 7 (2 - y) = 15 - 4y

Answer 1

Resposta:

a)

$x - 17 = - 9 \\ x = - 9 + 17 \\ x = 8$

b)

$3(x + 2) + 5 = x + 12 \\ 3x + 6 + 5 = x + 12 \\ 3x - x = 12 - 11 \\ 2x = 1 \\ x = \frac{1}{2}$

c)

$2x = - 7 \\ x = \frac{ - 7}{2}$

d)

$x + 4x - 4 = 9 - 2x -6 \\ 5x + 2x = 3 + 4 \\ 7x = 7 \\ x = \frac{7}{7} \\ x = 1$

e)

$3x - 2x = - 11 - 2 \\ x = - 13$

f)

$15x - 10 = 12x + 6 \\ 15x - 12x = 6 + 10 \\ 3x = 16 \\ x = \frac{16}{3}$

g)

$x = \frac{16}{2} \\ x =8$

h)

$6x - 2 + 6 - 2x = 0 \\ 4x = 4 \\ x = \frac{4}{4} \\ x = 1$

i)

$x = - 10$

j)

$7x - 7 = 6x + 2 \\ x = 9$

k)

$2x - 5x = - 1 - 14 \\ - 3 x= - 15( - 1) \\ \\3x = 15 \\ x = \frac{15}{3} \\ x = 5$

l)

$6 - 2y + 14 - 7y = 15 - 4y \\ - 9y + 4y = 15 - 6 - 14 \\ - 5y = - 5( - 1) \\ 5y = 5 \\ y = \frac{5}{5} \\ y = 1$