Question

1- Resolva as equações do 1° grau:

a) 4 x - 1 = 3 (x - 1)
b) 3 (x - 2) = 2 x - 4
c) 2 (x - 1) = 3 x + 4
d) 3 (x - 1) - 7 = 15
e) 7 (x - 4) = 2 x - 3
f) 3 (x - 2) = 4 (3 - x)
g) 3 (3 x - 1) = 2 (3 x + 2)
h) 7 (x - 2) = 5 (x + 3)
i) 3 (2x - 1) = 2 (x + 3)
j)5 x - 3 (+ 2) = 15

Answer 1

Resposta:

a) 4x -1 = 3(x-1)

4x -1 = 3x -3

4x + 3x = -3 + 1

7x = -2

x = -2/7

b) 3(x - 2) = 2x - 4

3x -6 = 2x -4

3x - 2x = -4 + 6

1x = 2

x = 2/1

x = 2

c) 2(x - 1) = 3x + 4

2x -2 = 3x + 4

2x + 3x = 4 + 2

5x = 6

x=6/5

d) 3(x - 1) - 7 = 15

3x -3 -7 = 15

3x = 15 + 3 + 7

3x = 25

x=25/3

e) 7(x - 4) = 2x - 3

7x -28 = 2x -3

7x -2x = -3 + 28

5x = 25

x = 25/5

x = 5

f) 3(x - 2) = 4 (3 - x)

3x -6 = 12 -4x

3x + 4x = 12 + 6

7x = 18

x = 18/7

g) 3(3x - 1) = 2 (3x + 2)

9x -3 = 6x + 4

9x -6x = 4 + 3

3x = 7

x = 7/3

h) 7(x - 2) = 5(x + 3)

7x -14 = 5x + 15

7x -5x = 15 + 14

2x = 29

x = 29/2

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

6x -3 = 2x + 6

6x -2x = 6 + 3

4x = 9

x = 9/4

j) 5x -3 (+2) = 15

5x -6 = 15

5x = 15 + 6

5x = 21

x = 21/5

Espero ter ajudado e que estejam certas :)