Question

Calcule no caderno as seguintes equações de 1º grau: a) 4x + 2 = 38 b) 9x = 6x + 12 c) 5x – 1 = 3x + 11 d) x - 3 = 9 E) x + 9= 17

Answer 1

a) 4x + 2 = 38

4x = 38 - 2

4x = 36

x = 36/4

x = 9

b) 9x = 6x + 12

9x - 6x = 12

3x = 12

x = 12/3

x = 4

c) 5x - 1 = 3x + 11

5x - 3x - 1 = 11

2x - 1 = 11

2x = 11 + 1

2x = 12

x = 12/2

x = 6

d) x - 3 = 9

x = 9 + 3

x = 12

e) x + 9= 17

x = 17 - 9

x = 8