Question

preciso das contas por favor ;)

Answer 1

Resposta:

a) 2y - 3y - 3 = 8 - 2y + 4

-y + 3 = 12 - 2y

2y - y = 12 - 3

y = 9

b) 6x - 5 + 5x = 10x + 6

6x + 5x - 10x = 6 + 5

x = 11

c) 6x + 12 = 4x + 24

6x - 4x = 24 - 12

2x = 12

x = 12/2

x = 6

d) 4x - 10x - 10 - 2x + 4 = 0

4x - 10x - 2x = 10 - 4

-8x = 6

x = - 6/8 |simplificando = -3/4|

e) 2x - 2 = 5x - 6x + 12

2x - 5x + 6x = 12 + 2

3x = 14

x = 14/3

f) 7x + 5x - 10 + 3x + 12 = 0

7x + 5x + 3x = 10 - 12

15x = -2

x = -2/15

Espero ter ajudado! :D

Answer 2

Resposta:

a) 2y -3 (y-1) =8-2 (y-2)

2y -3y +3 = 8 -2y +4

-y +3 = 12-2y

-y +2y = 12 -3

y =9

b) 6x - 5.(1 - x) = 10x  + 6

6x - 5 + 5x = 10x + 6

6x + 5x - 10x = 6 + 5  

11x - 10x = 11

=> x = 11

c) 3.(2x + 4) = 4.(x + 6)

6x + 12 = 4x + 24

6x - 4x = 24 - 12

2x = 12

x = 12/2

x = 6

d) 4x-10(x+1)-2(x-2)=0

4x - 10x - 10 - 2x + 4 = 0

-6x - 2x - 6 = 0

-8x - 6 = 0

-6 =8x

-6 / 8 = x

- 3/4 = x

e) 2 ( x - 1 ) = 5x - 3 ( 2x - 4 )

2x - 2 = 5x - 6x + 12

2x - 5x + 6x = 12 + 2

3x = 14

x = 14/3

f) 7x + 5 (x-2) + 3(x+4)=0  

7x + 5x - 10 + 3x + 12 =0

15 x + 2=0

15 x = - 2

x= - 2/15

Beijinhos...