Question

9) Resolva as seguintes equações:
a) x - 3 = 7
b) x + 4 = 10
c) 3x = 12
e) 6x -- 10 = 2x + 14
d) 7x - 1 = 13
f) 2(x - 1) - 7 = 16​

Answer 1

Resposta:

a)

$x - 3 = 7 \\ x = 7 + 3 \\ x = 10$

b)

$x + 4 = 10 \\ x = 10 - 4 \\ x = 6$

c)

$3x = 12 \\ x = 12 \div 3 \\ x = 4$

e)

$6x - 10 = 2x + 14 \\ 6x - 2x = 14 + 10 \\ 4x = 24 \\ x = 24 \div 4 \\ x = 6$

d)

$7x - 1 = 13 \\ 7x = 13 + 1 \\ 7x = 14 \\ x = 14 \div 7 \\ x = 2$

f)

$2(x - 1) - 7 = 16 \\ 2x - 2 - 7 = 16 \\ 2x = 2 + 7 + 16 \\ 2x = 25 \\ x = 25 \div 2 \\ x = 12.5$

Espero ter ajudado;-;