Question

01. Resolva as equações de 1o grau:
a) 10.(x +1) – 5.(x – 2)= 70

b) 5.(x +2) – 13= 2.(3x – 1)

Answer 1

Resposta:

$a) 10 \times (x +1) – 5 \times (x – 2)= 70 \\ 10x + 10 - 5x + 1 0 = 70 \\ 5x + 20 = 70 \\ 5x = 70 - 20 \\ 5x = 50 \\ x = 10$

$b) 5 \times (x +2) – 13= 2 \times (3x – 1) \\ 5x + 10 - 13 = 6x - 2 \\ 5x - 3 = 6x - 2 \\ 5x - 6x = - 2 + 3 \\ - x = 1 \\ x = - 1$

Answer 2

Oie, Td Bom?!

a)

10(x + 1) - 5(x - 2) = 70

10x + 10 - 5x + 10 = 70

5x + 20 = 70

5x = 70 - 20

5x = 50

x = 50/5

x = 10

b)

5(x + 2) - 13 = 2(3x - 1)

5x + 10 - 13 = 6x - 2

5x - 3 = 6x - 2

5x - 6x = - 2 + 3

- x = 1 . (- 1)

x = - 1

Att. Makaveli1996