Question

a) -3x = 2x - 10
b) 2x - 2 = 7 - x
c) 10 = 4 - 2x
d) 0,5y = 7 * 3y
e) -(2x - 1) = 4
f) 2 (x + 1) = x

* - razy

Prosze o pełne obliczenia ,z góry dzieki ; ]

Answer 1

a) -3x = 2x - 10

-5x=-10    /:(-5)

x=2

b) 2x - 2 = 7 - x

3x=9     :3

x=3

c) 10 = 4 - 2x

2x=-6     :2

x=-3

d) 0,5y = 7 * 3y

0,5y=21y

-20,5y=0     :(-20,5)

y=0

e) -(2x - 1) = 4

-2x+1=4

-2x=3     :(-2)

x=-1,5

f) 2 (x + 1) = x

2x+2=x

x=-2

Answer 2

a) -3x = 2x - 10

-3x - 2x = - 10

-5x = -10 / :(-5)

x = 2

 

b) 2x - 2 = 7 - x

2x + x = 7 + 2

3x = 9 / :3

x = 3

 

c) 10 = 4 - 2x

10 - 4 = -2x

6 = -2x / :-2

x = -3

 

d) Tego nie umiem ;<

 

e) -(2x - 1) = 4

-2x + 1 = 4

-2x = 4 - 1

-2x = 3 / :(-2)

x = -1,5

 

f) 2 (x + 1) = x

2x + 2 = x

2x - x = -2

1x = -2 / :1

x = -2