Question

Resolva : a)2,5× +1,4=1,6×-1,3
b) -z +12+5z= -2z +36
c)-0,5× + 4= 2,5+X
d)5b-110+2b=4b-20
e)24c+13=-12+5c-3.

Answer 1

Resolva :  TEMOS que ISOLAR as VARIAVEIS

 a)2,5× +1,4=1,6×-1,3

2,5x + 1,4 = 1,6x - 1,3 
2,5x + 1,4 - 1,6x = - 1,3
2,5x - 1,6x = - 1,3 - 1,4

0,9x = - 2,7
x = - 2,7/0,9
x = -  3



b) -z +12+5z= -2z +36

- z + 12 + 5z = - 2z + 36
- z + 5z + 12 = - 2z+ 36
+ 4z + 12 = - 2z + 36
+ 4z + 12 + 2z = + 36
+4z + 2z = + 36 - 12
6z = + 24
z = 24/6
z = 4

c)-0,5× + 4= 2,5+X

- 0,5x + 4 = 2,5 + x
- 0,5x + 4 - x = 2,5
- 0,5x - x = 2,5 - 4
- 1,5x =  - 1,5
x = - 1,5/-1,5
x = + 1,5/1,5
x = 1



d)5b-110+2b=4b-20


5b - 110 + 2b = 4b - 20
5b + 2b - 110 = 4b - 20
7b  - 110 = 4b - 20
7b - 110 - 4b = - 20
7b - 4b = - 20 + 110
3b = 90
b = 90/3
b = 30


e)24c+13=-12+5c-3.

24c + 13 = -  12 + 5c - 3
24c + 13 = - 12 - 3 + 5c
24c + 13 = - 15 + 5c
24c + 13 - 5c = - 15
24c - 5c = - 15 - 13
19c = - 28
c = - 28/19

Answer 2

Olá  Zayannecallera7,boa noite!

a) 2,5x + 1,4 = 1,6x - 1,3
2,5x - 1,6x = - 1,3 - 1,4
0,9x = - 2,7
x = - 2,7/0,9
x = - 3 


b) -z +12+5z= -2z +36
- z + 5z + 2z = 36 - 12
- z + 7z = 24
6z = 24
z = 24/6
z = 4


c)-0,5× + 4= 2,5+x
- 0,5x - x = 2,5 - 4
- 1,5x = - 1,5 .(-1)
1,5x = + 1,5
x = 1,5/1,5
x = 1


d)5b -110 + 2b= 4b - 20
5b + 2b - 4b = - 20+ 110
7b - 4b = + 90
3b = 90
b = 90/3
b = 30


e)24c+13= -12+5c-3.
24c - 5c = - 12 - 3 - 13
19c = - 28
c = - 28/19

Bons estudos! :)