Question

Resolver as equações ​

Answer 1

Resposta:

Explicação passo-a-passo:

a)

3x - 8 = 13

3x = 13 + 8

3x = 21

x = 21/3

x = 7

b)

12x - 10 = 5x + 11

12x - 5x = 11 + 10

7x = 21

x = 21/7

x = 3

c)

7x + 5 = 68 - 2x

7x + 2x = 68 - 5

9x = 63

x = 63/9

x = 7

d)

2(7x + 2) + 12(x + 1) = 2

14x + 4 + 12x + 12 = 2

26x + 16 = 2

26x = 2 - 16

26x = -14

x = -14/26

x = -7/13

e)

-2(x - 3) = 18

-2x + 6 = 18

-2x = 18 - 6

-2x = 12

x = 12/-2

x = -6

f)

4(x - 1) - 2(3x + 4) = 6

4x - 4 - 6x - 8 = 6

-2x - 12 = 6

-2x = 6 + 12

-2x = 18

x = 18/-2

x = -9

g)

a - 3a + 5a = 12

3a = 12

a = 12/3

a = 4

h)

5(y - 3) = 2y + 3

5y - 15 = 2y + 3

5y - 2y = 3 + 15

3y = 18

y = 18/3

y = 6