Question

1) Resolva as Equações:

a)
$x + 7 = 8$
b)
$x = 9 + 2x$
c)
$5x = 15$
d)
$7x = 16$
e)
$2x( + 7) = 13$
f)
$5x + 15 = 16 - 2x$
​

Answer 1

Resposta:

1) a) x = 1

b) -9 = x

c) x = 3

d) x = 16/7

e) x = 13/14

f) x = 1/7

Explicação:

1) a) x+7 = 8

x = 8-7

x = 1

b) x = 9+2x

-9 = 2x-x

-9 = x

c) 5x = 15

x = 15÷5

x = 3

d) 7x = 16

x = 16/7

e) 2x(+7) = 13

2x×7 = 13

14x = 13

x = 13/14

f) 5x+15 = 16-2x

5x+2x = 16-15

7x = 1

x = 1/7

Answer 2

a) x + 7 = 8 / x = 8 - 7 / x = 1

b) x = 9 + 2x / x - 2x = 9 / -x = 9 / x = -9

c) 5x = 15 / x = 15/5 / x = 3

d) 7x = 16 / x = 16/7

e) 2x(+7) = 13 / 14x = 13 / x = 13/14

f) 5x + 15 = 16 - 2x / 5x + 15 + 2x = 16 / 7x + 15 = 16 / 7x = 16 - 15 / 7x = 1 / x = 1/7