Question

equaçao do 1 grau . é so resolver as 3 com os calculos.

Answer 1

D ) 
(3x-5)=7*(2x-1)
3x-5 = 14x - 7
14x-3x = -5+7
11x= 2
x = 2/11

e) 5-x-9 = 6*(9x+3)
5-x-9 = 54x + 18
54x+x = 4-18
55x = -14
x = -14/55
 a outa é identica tente fazer..

Answer 2

a)
3x - 5 = 14x - 7
3x - 14x = - 7 + 5
- 11x = -2
x = 2/11

b)
5 - x + 9 = 6x + 18
5 + 9 - 18 = 6x + x
- 4 = 7x
x = - 4/7

c)
7 + x + 4 = 3x + 1
4 + 4 - 1 = 3x - x
7 = 2x
x = 7/2




10 equações:
1)
4.(2x - 1) = 10x - (-2)
8x - 4 = 10x + 2
8x - 10x = 2 + 4
- 2x = 6
x = -6/2 = - 3

2)
25 + 5x = 10x - 5
25 + 5x = 10x - 5
30 = 5x
x = 30/5 = 6

3)
12 - (4x + 2 - 6) = 4x
12 - 4x - 2 + 6 = 4x
12 - 2 + 6 = 4x + 4x
16 = 8x
x = 16/8 = 2

4)
14 + (20 - 15 - 3 + 34 + 6x) = 8x
34 - 15 - 3 + 34 + 6x = 8x
34 - 18 + 34 = 8x - 6x
50 = 2x
x = 50/2 = 25

5)
2.(x - 10 + 2) = 16. (2 - x)
2x - 20 + 4 = 32 - 16x
2x + 16x = 32 + 20 - 4
18x = 48
x = 48/18 (simplifica por 2) = 24/9 (simplifica por 3) = 8/3

6)
20 - 2. (3 + 2x + 2) = 15x - (3x)
20 - 6 - 4x - 4 = 12x
20 - 6 - 4 = 16x
10 = 16x
x = 10/16 = (simplifica por 2) = 5/8

7)
7x - (-5x + 14 ) = 2 . (2x - 3)
7x + 5x -14  = 4x - 6
7x + 5x - 4x = - 6 + 14
8x = - 8
x = - 8/8 = - 1

8)
5 + 15x + 30 = 10. (4 + x)
5 + 15x + 30 = 40 + 10x
15x - 10x = 40 - 30 - 5
5x = 5
x = 5/5 = 1

9) 
7x - 12 = 20 - x
7x + x = 20 + 12
8x = 32
x = 32/8 = 4

10)
10 - (2x + 6) = 5x - (2 + 3x)
10 - 2x - 6 = 5x - 2- 3x
10 - 6 + 2 = 5x + 3x + 2x
6 = 10x
x = 6/10 = (simplifica por 2) = 3/5