Question

ajuda ae por favor


a)4 (x -1) = x – 2

b)10x + 20 = 20x

c)14x + 4 = 6

d)2 ( u – 8) = 2 (2 – u)

e)4 = 2c

f) 25 = 8x

g)12y = 20

Answer 1

Resposta:

Explicação passo a passo:

a)4 (x -1) = x – 2   aplique a distributiva

4x-4=x-2

4x-x=4-2

3x=2

x=2/3

b)

10x + 20 = 20x

20=20x-10x

20=10x

20/10=x

2=x

x=2

c)

14x + 4 = 6

14x=6-4

14x=2

x=2/14=2÷2/14÷2

x=1/7

d)2 ( u – 8) = 2 (2 – u)  aplique a distributiva

2u-16=4-2u

2u+2u=4+16

4u=20

u=20/4

u=5

e)4 = 2c

2c=4

c=4/2

c=2

f) 25 = 8x

8x=25

x=25/8

g)12y = 20

y=20/12=20÷4/12÷4=5/3

Answer 2

Explicação passo-a-passo:

4 (x -1) = x – 2

4x-4=x-2

4x-x=-2+4

3x=2

x=2/3

10x + 20 = 20x

10x-20x=-20

-10x=-20(-1)

10x=20

x=20/10

x=2

14x + 4 = 6

14x=6-4

14x=2

x=2/14(÷2)

x=1/7

2 ( u – 8) = 2 (2 – u)

2u-16=4-2u

2u+2u=4+16

4u=20

u=20/4

u=5

4 = 2c

2c=4

c=4/2

c=2

25 = 8x

8x=25

x=25/8

12y = 20

y=20/12(÷4)

y=5/3