Question

Resolva as equações do 1° grau abaixo:


a) x – 3 = 7


b) 3x = 15


c) x – 5 = 8



d) x + 6 = 12 LEGIO



e) 2x = -20




f) -5x = -25 %3




D 9) = 4 h) = 5​

Answer 1

Resposta:

• a) x - 3 = 7

• x - 3 + 3 = 0

• x = 7 + 3

• x = 10

• b) 3x = 15

• x = 15 ÷ 3

• x = 5

• c) x - 5 = 8

• x - 5 + 5 = 0

• x = 8 + 5

• x = 13

• d) x + 6 = 12

• x + 6 - 6 = 0

• x = 12 - 6

• x = 6

• e) 2x = - 20

• x = - 10 ÷ 2

• x = - 10

• f) - 5x = - 25

• x = - 25 ÷ - 5

• x = 5

• g) x/3 = 4

• 3x/3 = 4 . 3

• x = 12

• h) 2x/4 = 5

• 4 . 2x/4 = 5 . 4

• 2x = 20

• x = 20 ÷ 2

• x = 10