Question

1. Resolva as seguintes equações:

a) 9x – 2 = 4x + 18

b) 2x – 10 + 7x + 10 = 180

c) 7y – 10 = y + 50

d) 4x – 18 + 3x = 10

e) 2x + 5 + x + 7 = 18

f) 5x – 91 = 4x – 77

g) 7x + 1 = 5x – 7

h) 4x + 5 = x + 20
me ajude e urgente ​

Answer 1

Resposta:

Explicação passo-a-passo:

a)9x-2= 4x+18

  9x-4x=18+2

  5x=20

   x= 20/5

   x=4

b) 2x-10+7x+10=180

   9x=180

   x=180/9

   x=20

c) 7y-10= y+50

   7y-y=50+10

    6y= 60

    y= 60/6

    y=10

d)4x-18+3x=10

   3x+4x=10+18

   7x=28

   x=28/7

   x=4

e) 2x+5+x+7=18

     2x+x= 18-5-7

  3x= 6

    x=6/3

    x=2

f)5x-91=4x-77

5x-4x=-77+91

  x= 14

g)7x+1=5x-7

   7x-5x=-7-1

  2x= -8

   x=-8/2

  x= -4

h) 4x+5=x+20

   4x-x= 20-5

   3x= 15

  x=15/3

  x=5

Answer 2

Resposta:

Explicação passo-a-passo:

a) 9x – 2 = 4x + 18

9x - 4x = 18+2

5x = 20

x = 20/5

x = 4

b) 2x – 10 + 7x + 10 = 180

9x = 180

x = 180/9

x = 20

c) 7y – 10 = y + 50

7y - y = 50+10

6y = 60

y = 60/6

y = 10

d) 4x – 18 + 3x = 10

7x = 10+18

7x = 28

x = 28/7

x = 4

e) 2x + 5 + x + 7 = 18

3x +12 = 18

3x = 18-12

3x = 6

x = 6/3

x = 2

f) 5x – 91 = 4x – 77

5x - 4x = - 77 + 91

x = 14

g) 7x + 1 = 5x – 7

7x -5x = -7-1

2x = -8

x = -8/2

x = -4

h) 4x + 5 = x + 20

4x-x = 20-5

3x = 15

x = 15/3

x = 5

________

. Encontre o valor de “x” nas seguintes equações:

a) 6x = 2x + 16

6x - 2x = 16

4x = 16

x = 16/4

x = 4

b) 2x – 5 = x + 1

2x - x = 1+5

x = 6

d) 5x + 7 = 4x + 10

5x - 4x = 10-7

x = 3

e) 4x – 10 = 2x + 2

4x - 2x = 2+10

2x = 12

x = 12/2

x = 6

f) 4x – 7 = 8x – 2

- 7 + 2 = 8x - 4x

- 5 = 4x

4x = - 5

x = - 5/4

g) 2x + 1 = 4x – 7

1+7 = 4x - 2x

8 = 2x

2x = 8

x = 8/2

x = 4

h) 9x + 9 + 3x = 15

12x = 15-9

12x = 6 (:6)

2x = 1

x = 1/2

i) 16x – 1 = 12x + 3

16x - 12x = 3+1

4x = 4 (:4)

x = 1

j) 3x – 2 = 4x + 9

- 2 - 9 = 4x - 3x

- 11 = x

x = - 11

l) 5x -3 + x = 2x + 9

6x - 3 = 2x + 9

6x - 2x = 9+3

4x = 12

x = 12/4

x = 3

n) x + x – 4 = 17 – 2x + 1

2x - 4 = 18 - 2x

2x+2x = 18+4

4x = 22 (:2)

2x = 11

x = 11/2

o) x + 2x + 3 – 5x = 4x – 9

3x - 5x + 3 = 4x - 9

- 2x + 3 = 4x - 9

3+9 = 4x+2x

12 = 6x

6x = 12

x = 12/6

x = 2

p) 5x + 6x – 16 = 3x + 2x - 4

6x - 16 = 5x - 4 - 5x

6x - 16 = - 4

6x = - 4 + 16

6x = 12

x = 12/6

x = 2

q) 5x + 4 = 3x – 2x + 4

5x + 4 = x + 4

5x - x = 4-4

4x = 0

x = 0/4

x = 0