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Odpowiedź :

Odpowiedź:

7.

b)

- 6x + 8 = 4

- 6x = 4 - 8

- 6x = - 4 / : (-6)

x = 4/6

x = 2/3

c)

5x - 14 = 6

5x = 6 + 14

5x = 20 / : 5

x = 4

d)

9 - x = 24

- x = 24 - 9

- x = 15 / * (-1)

x = - 15

e)

5 + 4x = 29

4x = 29 - 5

4x = 24 / : 4

x = 6

f)

1/5x - 2 = 4

1/5x = 4 + 2

1/5x = 6 / * 5

x = 30

8.

a)

2x = 2 / : 2

x = 1

b)

x + 1 = 2

x = 2 - 1

x = 1

c)

- x + 8 = 0

- x = - 8 / * (-1)

x = 8

d)

62 + 3x = 32

3x = 32 - 62

3x = - 30 / : (-3)

x = 10

e)

2y - 3 = 5

2y = 5 + 3

2y = 8 / : 2

y = 4

f)

- 1/2z + 1 = -4

- 1/2z = -4 - 1

- 1/2z = -5 / * (-2)

z = 10

Szczegółowe wyjaśnienie:

z7

b) -6x + 8 = 4       /-8

-6x = -4     /: (-6)

x = [tex]\frac{4}{6}[/tex]

c) 5x - 14 = 6    /+14

5x = 20      /:5

x = 4

d) 9 - x = 24      /-9

-x = 15     /: (-1)

x = -15

e) 5 + 4x = 29       /-5

4x = 24      /:4

x = 6

f) [tex]\frac{1}{5}[/tex]x - 2 = 4      /+2

[tex]\frac{1}{5}[/tex]x = 6        /·5

x = 30

z8

a) 4x - 6x = 2

-2x = 2      /: (-2)

x = -1

b) 5x - 4x + 1 = 2

x + 1 = 2        /-1

x = 1

c) 6x + 8 - 7x = 0

-x + 8 = 0      /-8

-x = -8        /:(-1)

x = 8

d) 62 + 5x - 2x = 32

62 + 3x = 32       /-62

3x = -30       /:3

x = -10

e) y - 3 + y = 5

2y - 3 = 5        /+3

2y = 8        /:2

y = 4

f) [tex]\frac{1}{2}[/tex]z + 1 - z = -4

-[tex]\frac{1}{2}[/tex]z + 1 = -4      /-1

-[tex]\frac{1}{2}[/tex]z = -5         /·(-2)

z = 10