Question

2-resolva as equações do 1° grau abaixo.

a)3x - 7 = 2x + 5

b) 7x+8 = 4x - 10

c) 4x - 15 = -2x + 3

d) 2 - 3x = -2x + 12 - 3x

e) 4 (x - 5) = 3 ( x + 6)

f) 3 (x - 1 ) = 5 (-x + 9 )

g) 13 + 4 (2x - 1 ) = 5 ( x + 2)

h) 4 (x + 5 ) + 3 ( x + 5) = 21​

Answer 1

Resposta:

a 3x -7= 2x+5

3x -2x= 5+7

1x=12⇒ x=12

b) 7x+8=4x-10

7x -4x= -10-8

3x= -18

x= -18/3⇒ x= -6

c) 4x-15= -2x3

4x+2x= 315

6x=18

x18/6⇒x=3

d) 2-3x= -2x +12 - 3x

-3x +2x +3x= +12 -2

2x= 10

x= 10/2⇒ x=5

e) 4(x-5)= 3(x+6)

4x-20=3x+18

4x-3x=20+18

x=38

f) 3(x-1)= 5(-x+9)

3x-3= -5x+45

3x-3= -5x+45

3x+5x=+45+3

8x= 48

x=48/8⇒ x=6

g) 13+4 (2x-1)= 5(x+2)

13+8x-4= 5x+10

8x-5x=10+4-13

3x=1 ⇒x=1/3

h) 4(x+5) +3( x+5)=21

4x+20+3x+15=21

7x=+21-20-15

7x=+1-15

7x= -14

x= -14/7⇒x= -2

Explicação passo-a-passo: