Question

1) Resolva as seguintes questões:

A) x-3=7
B)7x-1=13
C)6x-10=2x+14
D)6x=2x+28

2)Resolva as equações que envolvem multiplicação:

A) 3(x+2)=15
B) 2(x-1)-7=16
C) 7(x-2)=5(x+3)
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Answer 1

Explicação passo-a-passo:

Número 1:

a) x - 3 = 7

x = 7 + 3

x = 10

b) 7x - 1 = 13

7x = 13 + 1

7x = 14

x = 14/7

x = 2

c) 6x-10=2x+14

6x - 2x = 14 + 10

4x = 24

x = 24/4

x = 6

d) 6x = 2x + 28

6x - 2x = 28

4x = 28

x = 28/4

x = 7

Número 2

a) 3 (x + 2) = 15

3x + 6 = 15

3x = 15 - 6

3x = 9

x = 9/3

x = 3

b) 2 (x - 1) - 7 = 16

2x - 2 - 7 = 16

2x = 16 + 2 + 7

2x = 25

x = 25/2

x =  12,5

c) 7 (x - 2) = 5 (x + 3)

7x - 14 = 5x + 15

7x - 5x = 15 + 14

2x = 29

x = 29/2

x = 14,5

Answer 2

Resposta:

1)

A) x - 7 = 3

A) x = 3 + 7

A) x = 10

B) 7x - 1 = 13

B) 7x = 13 + 1

B) 7x = 14

B) x = 2

B) 7x ÷ 7 = 14 ÷ 7

B) x = 14 ÷ 7

B) x = 2

C) 6x - 10 = 2x + 14

C) 6x - 2x = 14 + 10

C) 4x = 14 + 10

C) 4x = 24

C) x = 24 ÷ 4

C) x = 6

D) 6x = 2x + 28

D) 6x -2x + 28

D) (6 - 2)x + 28

D) 4x = 28

D) 4x ÷ 4 = 28 ÷ 4

D) x = 28 ÷ 4

D) x = 7

2)

A) 3 (x + 2) = 15

A) 3 (x + 2) ÷ 3 = 15 ÷ 3

A) x + 2 = 15 ÷ 3

A) x + 2 = 5

A) x = 5 - 2

A) x = 3

B) 2 (x - 1) - 7 = 16

B) 2x - 2 - 7 = 16

B) 2x - 9 = 16

B) 2x = 16 + 9

B) 2x = 25

B) 2x ÷ 2 = 25 ÷ 2

B) x = 25 ÷ 2

B) x = 25/2

C) 7 (x - 2) = 5 (x + 3)

C) 7x - 14 = 5x + 15

C) 7x - 5x - 14 = 15

C) 7x - 5x = 15 + 14

C) 2x = 15 + 14

C) 2x = 29

C) 2x ÷ 2 = 29 ÷ 2

C) x = 29 ÷ 2

C) x = 29/2