Question

25 PONTOS - Resolva as equações do 1º grau. 2 x + 6 = x + 18 5 x – 3 = 2 x + 9 3 (2x-3) + 2 (x + 1) = 3x + 18 2x + 3 (x – 5) = 4x + 9 5) 2 (x + 1) – 3 (2x – 5) = 6x – 3

Answer 1

Resposta:

Explicação passo a passo:

Resolva as equações do 1º grau.

A)

2 x + 6 = x + 18

2x - x = 18 - 6

X = 12

________________

B)

5 x – 3 = 2 x + 9

5x - 2x = 9 + 3

3x = 12

x = 12/3

x = 4

____________

C)

3 (2x-3) + 2 (x + 1) = 3x + 18

6x - 9 + 2x + 2 = 3x + 18

8x - 7 = 3x + 18

8x - 3x = 18+7

5x = 25

x = 25/5

x = 5

_________

D)

2x + 3 (x – 5) = 4x + 9

2x + 3x - 15 = 4x + 9

5x - 15 = 4x + 9

5x - 4x = 9 + 15

x = 24

____________

E)

2 (x + 1) – 3 (2x – 5) = 6x – 3

2x + 2 - 6x + 15 = 6x - 3

- 4x + 17 = 6x - 3

17+3= 6x + 4x

20 = 10x (:10)

2 = x

x = 2