Question

1. Resolva as Equações do 1° grau a) 3 + x = 0 b) 23x + 2 = 2 c) 12 – 7 + 4x = 25 d) 5x – 3x = 30 e) 4x + 10 = 45 – 3x f) a) 20x - 4 = 5x g) 4x = -8x + 36 h) 4(x - 3) = 2x – 5 i) b) 5(1 - x) - 2x + 1 = -3(2 + x)

Answer 1

Resposta:

a) 3+x=0

x = -3

b) 23x + 2 = 2

23x = 2 - 2

x = 0

c) 12 - 7 + 4x = 25

5 + 4x = 25

4x = 25 - 5

x = 20/4

x = 5

d) 5x - 3x = 30

2x = 30

x = 30/2

x = 15

e) 4x + 10 = 45 - 3x

4x + 3x = 45 - 10

7x = 35

x = 35/7

x = 5

f) 20x - 4 = 5x

20x - 5x = 4

15x = 4

x = 4/15

g) 4x = -8x + 36

4x + 8x = 36

12x = 36

x = 36/12

x = 3

h) 4(x - 3) = 2x - 5

4x -12 = 2x - 5

4x -2x = -5 + 12

2x = 7

x = 7/2

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

5 - 5x - 2x + 1 = -6 -3x

6 -7x = -6 -3x

-7x + 3x = -6 -6

-4x = -12

-x = -12/4

-x = -3 . (-1)

x = 3