Question

Alguém me ajudaaaa???,

Answer 1

Resposta:

Explicação passo-a-passo:

1)

a) 12x = 9(x + 2) => 12x = 9x + 18 => 12x - 9x = 18 => 3x = 18 => x = 18/3 => x = 6

b) 2x = 4.3 => 2x = 12 => x = 12/2 => x = 6

2)

a) 21(2x - 2) = 12(3x + 1) => 42x - 42 = 36x + 12 => 42x - 36x = 12 + 42 => 6x = 54 => x = 54/6 => x = 9

b) (x + y)/x = (4 + 9)/4 => 26/x = 13/4 => 13x = 4.26 => x = 4.26/13 => x = 4.2 => x = 8

Mas,

x + y = 26 => 8 + y = 26 => y = 26 - 8 => y = 18

3)

a) 3(2x - 2) = 2(2x + 6) => 6x - 6 = 4x + 24 => 6x - 4x = 24 + 6 => 2x = 30 => x = 30/2 => x = 15

b) (x + y)/x = (8 + 10)/8 => 9/x = 18/10 => 18.x = 10.9 => 18x = 90 => x = 90/18 => x = 10/2 => x = 5

Mas,

x + y = 9 => 5 + y = 9 => y = 9 - 5 => y = 4