Question

PRECISO PARA HOJE !!1
1ª Questão:
Determine o valor de x nas equações abaixo:
a) 5x − 4 = 2x + 5
b) 2x − 10 = x + 4
c) 5x + 7 = 4x + 11
d) 4x − 10 = 2x + 8
e) 4x − 10 = x + 5

Answer 1

Resposta:

1.

a) x − 2 = 11

x= 11+2

x= 13

b) x − 5 = 15

x= 15+5

x= 20

c) x + 8 = 4

x= 4-8

x= -4

d) x − 8 = −10

x= -10 +8

x= -2

e) x + 7 = 10

x= 10-7

x= 3

f) x − 3 = −1

x= -1+3

x= +2

2.

a) 2x = 8

x= 8/2

x= +4

b) 3x = 15

x= 15/3

x= +5

c) −3x = 6

-x = 6/3

-x(-1)= +2

x= +2

d) 2x = 30

x = +30/2

x= +15

3.

a) 2x + 5 = 27

2x = +27 - 5

2x= +22

x= +22/2

x= +11

b) 4x − 8 = 2x + 6

4x- 2x = +6 +8

2x = 14

x= 14/2

x= +7

c) 7x + 1 = 4x + 13

7x -4x= +13 -1

3x= +12

x= +12/3

x= 4

d) 5x − 3 = 2x − 9

5x -2x = -9 +3

3x= -6

x= -6/3

x= -6

e) 8x − 9 = 4x + 11

8x - 4x = +11 +9

4x = +20

x= + 20/4

x= +5

f) 7x + 5 = 68 − 2x

7x + 2x= +68 - 5

9x = +63

x = +63/9

x = 7

g) 10 − 4x = 28 + 2x

- 4x - 2x = 28 - 10

-6x = +18

-x(-1)= +18/6

x = +3

h) x − 3x + 5x = 12

-2x +5x = 12

+3x= 12

x = 12/3

x = 4

Explicação passo a passo: