Question

ayudenme, es para hoy

Resuelve correctamente las siguientes ecuaciones.


a) 10x - 9 = 25 + 7x

b) 2.5x = 15.5 - x

c) 20 - 20x = 600

d) 15 + 2x = 80 – 5x

Answer 1

Respuesta:

a) 10x - 9 = 25 + 7x

   10x - 9 - 7x = 25

   10x - 7x = 25 + 9

   10x - 7x = 25 + 9

  3x = 25 + 9

   3x = 34

   3x = 34

   x = 34/3

b) 2.5x = 15.5 - x

   10x = 15.5 - x

   10x = 15.5 - x

   10x = 75 - x

   10x + x = 75

   10x + x = 75

  11 x = 75

  x = 75/11

Explicación paso a paso:

c) 20 - 20x = 600

  - 20x = 600 - 20

  - 20x = 600 - 20

  - 20x = 580

  - 20x = 580

   x = - 29

d) 15 + 2x = 80 – 5x

   15 + 2x + 5x = 80

   2x + 5x = 80 – 15

   2x + 5x = 80 – 15

  7x = 80 – 15

  7x = 80 – 15

   7x = 65

   7x = 65

     x = 65/7

Answer 2

a) 10x - 9 = 25 + 7x 10x - 7x = 25 + 9 3x = 34 x = 34/3 b) 2,5x = 15,5 - x 2,5x + x = 15,5 3,5x = 15,5 x =15,5 / 3,5 x = 4,43 c) 20 - 20x = 600 - 20x = 600 - 20 - 20x = 580 20x = - 580 x = - 580 / 20 x = - 29 d) 15 + 2x = 80 – 5x 2x + 5x = 80 - 15 7x = 65 x = 65 / 7