Question

1 - Resolva as seguintes equações do primeiro grau com uma incógnita.
a) 3 – 2 (x + 3) = x – 18
b) 4(x - 2) – 5(2 – 3x) = 4(2x – 6)
c) 50 + (3x – 4) = 2(3x – 4 ) + 26

Answer 1

Resposta:

Olá bom dia!

a) 3 – 2 (x + 3) = x – 18

3 - 2x  - 6 = x -18

-2x - x = -18 + 6 - 3

-3x = -21 +6

-3x = -15  .(-1)

x = 15 : 3

x = 5

S =  {5}

 

b) 4(x - 2) – 5(2 – 3x) = 4(2x – 6)

4x - 8 - 10 + 15x = 8x - 24

4x + 15x - 8x = -24 + 10 + 8

19x - 8x = -14 + 8

11x = - 6

x = $-\frac{6}{11}$

S = {-6/11}

c) 50 + (3x – 4) = 2(3x – 4 ) + 26

50 + 3x - 46 = 6x - 8 + 26

3x + 4 = 6x + 18

3x - 6x = 18 - 4

-3x = 14

$x = -\frac{14}{3}$

S = {-14/3}

Answer 2

Resposta:

a) 3-2x-6=x-18

-3-2x=x-18

-2x-x=-18+3

-3x=-15

x=5

b) 4x-8-10+15x=8x-24

19x-18=8x-24

19x-8x=-24+18

11x=-6

x=-$\frac{6}{11}$    ou x=-0,54

c) (3x-4)-2(3x-4)=26-50

(1-2)*(3x-4)=26-50

-1(3x-4)=26-50

3x-4=-26+50

3x-4=24

3x=24+4

3x=28

x=$\frac{28}{3}$