Question

Me ajudem por favor.

A) 2z-8=34

B) 4b+15-25-b

C) 6y+16=4y+42

D) 5(4x+10)=15×+55

F) 3(2c+5)=2(5c-4

Answer 1

a) z = 21

b) b = 10/3

c) y = 13

d) x = 1

e) c = 23/4

a) 2z - 8 = 34

2z = 34 + 8

2z = 42

z = 42/2

z = 21

b) 4b + 15 - 25 - b = 0

4b - b = -15 + 25

3b = 10 (pode acabar aqui, mas se quiser continuar)

b = 10/3

c) 6y + 16 = 4y + 42

6y - 4y = 42 - 16

2y = 26

y = 26/2

y = 13

d) 5(4x + 10) = 15x + 55

20x + 50 = 15x + 55

20x - 15x = 55 - 50

5x = 5

x = 1

e) 3(2c + 5) = 2(5c - 4)

6c + 15 = 10c - 8

6c - 10c = -8 - 15 (-1)

4c = 23 (mesmo esquema da b)

c = 23/4