Question

Rozwiąż równanie i sprawdź.

a) -8z + 5 = -z -1

b) 6 - 5x= 2x-7

c) 7y - 8 = -y + 24

d) -2m + 7 = m - 6

e) -5t + 1 = 8 - 6t

Proszą pamóźcie!

Answer 1

a) -8z + 5 = -z -1

-8z + z = - 1 - 5

-7z = -6 / -7

z= 6/7

 

spr

-8z + 5 = -z -1

-8 * 6/7 + 5 = - 6/7 - 1

-48/7 + 5 = - 1  6/7

- 6  6/7 + 5 = - 1  6/7

- 1  6/7 = - 1  6/7

 

 

 

 

 

b) 6 - 5x= 2x-7

-5x - 2x = -7 - 6

-7x = - 13 / (-7)

x = 13/7

x= 1  6/7

 

 

spr

6 - 5x= 2x-7

6 - 5 * 13/7 = 2 * 13/7 - 7

6 - 9  2/7 = 26/7 - 7

- 3  2/7 = 3  5/7  - 7

-3  2/7 = - 3   2/7

 

 

 

 

 

c) 7y - 8 = -y + 24

7y + y = 24 + 8

8y = 32 / 8

y = 4

 

spr

7y - 8 = -y + 24

7*4 - 8 = -4 + 24

28 - 8 = 20

20 = 20

 

 

 

 

 

d) -2m + 7 = m - 6

-2m - m = -6 - 7

-3m = - 13 / (-3)

m = 4  1/3

 

 

spr

-2m + 7 = m - 6

-2 * 4  1/3 + 7 = 4  1/3 - 6

- 8 2/3 + 7 = - 1  2/3

- 1  2/3 = - 1  2/3

 

 

 

 

 

e) -5t + 1 = 8 - 6t

-5t + 6t = 8 - 1

t= 7

 

spr

-5t + 1 = 8 - 6t

-5 * 7 + 1= 8 - 6 * 7

- 35 + 1 = 8 - 42

- 34 = - 34