Question

1 a. 5x + 4 = 2x + 25
4 b. 3x - 5+x= 19
C. 2(x+5) = 32
d. 7x + 3 = 2(x + 7) +9​

Answer 1

Respuesta:

Explicación paso a paso:

5x + 4 = 2x + 25      5x - 2x = 25 - 4        3x = 21      x = 21/3      x = 7

4 b. 3x - 5+x= 19     4x = 19+5          4x = 24   x = 24/4      x = 6

C. 2(x+5) = 32      2x +10 = 32    2x = 32 - 10       2x = 22     x = 22/2    x = 11

d. 7x + 3 = 2(x + 7) +9​   7x = 2x + 14 +9 - 3      7x - 2x = 20    5x=20  x=20/5

                                                                                                              x = 4

Answer 2

- Ecuaciones:

a) 5x + 4 = 2x + 25

5x - 2x = 25 - 4

3x = 21

x = 21 : 3

x = 7

Comprobamos:

5x + 4 = 2x + 25

5 . 7 + 4 = 2 . 7 + 25

35 + 4 = 14 + 25

39 = 39

b) 3x - 5 + x = 19

4x - 5 = 19

4x = 19 + 5

4x = 24

x = 24 : 4

x = 6

Comprobamos:

3x - 5 + x = 19

3 . 6 - 5 + 6 = 19

18 - 5 + 6 = 19

13 + 6 = 19

19 = 19

c) 2 . (x+5) = 32

2x + 10 = 32

2x = 32 - 10

2x = 22

x = 22 : 2

x = 11

Comprobamos:

2 . (x+5) = 32

2 . (11 + 5) = 32

2 . 16 = 32

32 = 32

d) 7x + 3 = 2 . (x+7) + 9

7x + 3 = 2x + 14 + 9

7x + 3 = 2x + 23

7x - 2x = 23 - 3

5x = 20

x = 20 : 5

x = 4

Comprobamos:

7x + 3 = 2 . (x+7) + 9

7 . 4 + 3 = 2 . (4 + 7) + 9

28 + 3 = 2 . 11 + 9

31 = 22 + 9

31 = 31