Question

a) 3y -25 = y – 5
b) 7x – 29 = x – 11
c) 12y = 9y + 15 d) 9y – 31 = -10 + 2y e) 11x -3-x = 16 + 7x – 5 + x
procedimiento y comprobación​

Answer 1

Respuesta:

a) 10

b) 3

c) 5

d) 3

e) 7

Explicación paso a paso:

a) 3y - 25 = y - 5

3y - y = - 5 + 25

2y = 20

y = 10

3(10) - 25 = 10 - 5

30 - 25 = 5

5 = 5

b) 7x - 29 = x - 11

7x - x = - 11 + 29

6x = 18

x = 3

7(3) - 29 = 3 - 11

21 - 29 = - 8

- 8 = - 8

c) 12y = 9y + 15

12y - 9y = 15

3y = 15

y = 5

12(5) = 9(5) + 15

60 = 45 + 15

60 = 60

d) 9y - 31 = - 10 + 2y

9y - 2y = - 10 + 31

7y = 21

y = 3

9(3) - 31 = - 10 + 2(3)

27 - 31 = - 10 + 6

- 4 = - 4

e) 11x - 3 - x = 16 + 7x - 5 + x

11x - x - 7x - x = 16 - 5 + 3

2x = 14

x = 7

11(7) - 3 - 7 = 16 + 7(7) - 5 + 7

77 - 3 - 7 = 16 + 49 - 5 + 7

67 = 67