Question

2)Resolva as seguintes equações:a) 3x – 4 = 2x + 8       b) 2x – 5 = x + 1       c)  5x – 3 + 5 x = 4x – 9         d)  x + 2x + 3 – 5x = 4x – 9       e) 4 ( x + 3 ) = 1       f) 5 ( 2x – 4 ) = 7 ( x + 1 ) – 3       g) 4x – 1 = 3 ( x – 1 )  ​

Answer 1

a) 3x - 4 = 2x + 8

3x - 2x = 8 + 4

x = 12

b) 2x - 5 = x + 1

2x - x = 1 + 5

x = 6

c) 5x - 3 + 5x = 4x - 9

5x + 5x - 4x = -9 + 3

10x - 4x = -6

6x = -6

x = 6/-6

x = -1

d) x + 2x + 3 - 5x = 4x - 9

x + 2x - 5x - 4x = -9 - 3

3x - 5x - 4x = -12

-6x = -12

x = -12/-6

x = 2

e) 4 (x+3) = 1

4 (3x) = 1

3x = 1 - 4

3x = -3

x = -3/3

x = - 1

f) 5 (2x - 4) = 6 (x + 1) - 3

5 (-2x) = 6 (2x) - 3

-2x - 2x = 6 - 3 - 5

-4x = -2

x = -4/-2

x = 2

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

4x - 1 = 3

4x = 3 + 1

4x = 4

x = 4/4

x = 1