Question

Resolva as equações de 1°grau abaixo e marque as que apresentam o correto valor de x. a) x + 5 = 0 b) 5x - 8 = 2 c) 4x + 12 = 24 d) 8x – 3x = 30​

Answer 1

Resposta:

a) x + 5 = 0

x + 5 - 5 = 0

x = 0 - 5

x = - 5

________

b) 5x - 8 = 2

5x - 8 + 8 = 0

5x = 2 + 8

5x = 10

x = 10÷5

x = 2

________

c) 4x + 12 = 24

4x + 12 - 12 = 0

4x = 24 - 12

4x = 12

x = 12÷4

x = 3

________

d) 8x - 3x = 30

5x = 30

x = 30÷5

x = 6

Answer 2

a) x + 5 = 0

x + 5 - 5 = 0

x = 0 - 5

x = - 5

________

b) 5x - 8 = 2

5x - 8 + 8 = 0

5x = 2 + 8

5x = 10

x = 10÷5

x = 2

________

c) 4x + 12 = 24

4x + 12 - 12 = 0

4x = 24 - 12

4x = 12

x = 12÷4

x = 3

________

d) 8x - 3x = 30

5x = 30

x = 30÷5

x = 6