Question

1. 2x + 5 = x + 6
2. 3x - 1 = x + 9
3. 2x - 5 = -x + 7
4.-x + 7 = x + 21
5. 1 + 9x = -89 - x
6. 2(x-3) = -6
7.-4(x-2) = 12
8. -7(x-3) = -14
9. -5(x-3) + 7 = 2
10. -6(x+7) +3x = -42

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Answer 1

Răspuns:

In atasament

Answer 2

Răspuns:

Explicație pas cu pas:

1.

2 x + 5 = x + 6

2 x - x = 6 - 5

x = 1

______________

2.

3 x - 1 = x + 9

3 x - x = 9 + 1

2 x = 10

x = 10 : 2

x = 5

________________

3.

2 x - 5 = - x + 7

2 x + x = 7 + 5

3 x = 12

x = 12 : 3      =>     x = 4

___________________

4.

- x + 7 = x + 21

- x - x = 21 - 7

- 2 x = 14

x = 14 : ( - 2)     =>   x = - 7

________________________

5.

1 + 9 x = - 89 - x

9 x + x = - 89 - 1

10 x = - 90

x = ( - 90 ) : 10     =>   x = - 9

_________________________

6.

2(x-3) = - 6

2 x - 6 = - 6

2 x = 6 + 6

2 x = 0     =>     x = 0

____________________

7.

- 4(x-2) = 12

- 4 x + 8 = 12

- 4 x = 12 - 8

- 4 x = 4

x = 4 : ( - 4)   =>  x = - 1

_____________________

8.

- 7 ( x - 3 ) = - 14

- 7 x + 21 = - 14

- 7 x = - 14 - 21

- 7 x = - 35

x = ( - 35) : ( - 7)    =>   x = 5

_______________________

9.

- 5 ( x - 3 ) + 7 = 2

- 5 x + 15 + 7 = 2

- 5 x + 22 = 2

- 5 x = 2 - 22

- 5 x = - 20

x = ( - 20) : ( - 5)    =>    x = 4

________________________

10.

- 6 ( x + 7 ) + 3 x = - 42

- 6 x - 42 + 3 x = - 42

- 3 x = - 42 + 42

- 3 x = 0   =>     x = 0