Question

Resolva no seu caderno as equações a seguir. a) 2x – 8 = 8 b) 3x + 1 = 19 c) 7y – 4 = 10 d) 2t + 1 = -10 e) 8x – 14 = 2x f) 7x + 1 + 5x = 9 g) y + 9y + 3 = -5 h) 17x – 1 = 15x + 3 i) 16 – x = x + 25

Answer 1

Oie, Td Bom?!

a)

2x - 8 = 8

2x = 8 + 8

2x = 16

x = 16/2

x = 8

b)

3x + 1 = 19

3x = 19 - 1

3x = 18

x = 18/3

x = 6

c)

7y - 4 = 10

7y = 10 + 4

7y = 14

y = 14/7

y = 2

d)

2t + 1 = - 10

2t = - 10 - 1

2t = - 11

t = - 11/2

e)

8x - 14 = 2x

8x - 2x = 14

6x = 14

x = 14/6

x = [14 ÷ 2]/[6 ÷ 2]

x = 7/3

f)

7x + 1 + 5x = 9

12x + 1 = 9

12x = 9 - 1

12x = 8

x = 8/12

x = [8 ÷ 4]/[12 ÷ 4]

x = 2/3

g)

y + 9y + 3 = - 5

10y + 3 = - 5

10y = - 5 - 3

10y = - 8

y = - 8/10

y = - [8 ÷ 2]/[10 ÷ 2]

y = - 4/5

h)

17x - 1 = 5x + 3

17x - 5x = 3 + 1

12x = 4

x = 4/12

x = [4 ÷ 4]/[12 ÷ 4]

x = 1/3

i)

16 - x = x + 25

- x - x = 25 - 16

- 2x = 9

x = 9/-2

x = - 9/2

Att. Makaveli1996