Question

Ajuda ae

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:

a) x=2/3

b) x=2

c) x=1/7

d) u=4

e) c=2

f) x=25/8

g) y=5/3

Explicação passo-a-passo:

a) 4(x-1)=x-2 => 4x-4=x-2 => 4x-x=4-2 => 3x=2 => x=2/3

b) 10x+20=20x => 20x-10x=20 => 10x=20 => x=20/10 => x=2

c) 14x+4=6 => 14x=6-4 => 14x=2 => x=2/14 => x=1/7

d) 2(u-8)=2(2-u) => 2u-16=4-2u => 2u+2u=4+16 => 4u=20 => u=20/5 => u=4

e) 4=2c => c=4/2 => c=2

f) 25=8x => x=25/8

g) 12y=20 => y=20/12 => y=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