Question

me ajudem com essas equações pfv (1o grau) preciso das contas a) 2x + 5 = 27 b) 4x -8 = 2x + 6 c) 7x + 1 = 6x + 6 d) 5x - 3 = 2x - 9 e) 4x - 7 + x = 1 f) 8 - 2x = - 4x g) 9 + 3x = x + 13 h) 2x + 7 = - 4x + 13

Answer 1

Resposta:

A) 2X + 5 = 27

2X = 27 - 5

2X = 22

X = 22 ÷ 2

X = 11

B) 4X - 8 = 2X + 6

4X - 2X = 6 + 8

2X = 14

X = 14 ÷ 2

X = 7

C) 7X + 1 = 6X + 6

7X - 6X = 6 - 1

X = 5

D) 5X - 3 = 2X -9

5X - 2X = (-9) +3

3X = -6

X= -6 ÷ 3

X= -2

E) 4X - 7 + X = 1

4X - X = 1 + 7

3X = 8

X = 8 ÷ 3

X = 2,6

F) 8 - 2X = - 4

- 2X = (-4) - 8

X = - 12 ÷ - 2

X = 6

G) 9 + 3X = X + 13

3X - X = 13 - 9

2X = 4

X = 4 ÷ 2

X = 2

H) 2 X + 7 = -4X + 13

2X + 4X = 13 - 7

6X = 6

X = 6 ÷ 6

X = 1