Question

3) Resolva cada uma das equaçoes abaixo
utilizando as operações inversas
a) 2 (x-3) = 6
b) 5 – 4x= - 11 - 5x
c) 1-2(x - 1) = 6
d) 8x +x =27
e) x + 5 = - 7 (x-3)
f) 2x- 3 + x = -5 + 2x
g) 2x + 3(-x + 1) = 5
h) 4x – 18 + 3x = 10​

Answer 1

a) *distributiva*

2x-6=6

2x=6+6

x=12/2

x=6

b)5-4x= -11-5x

-4x+5x= -11+5

x= -6

c) 1-2(x-1)=6

1(x-1)=6

1x-1=6

x=6+1

x=7

d)8x+x=27

9x=27

x=27/9

x=3

e) x+5= -7(x-3)

x+5= -7x +21

x+7x=21-5

8x=16

x=16/8

x=2

f)2x-3+x= -5+2x

3x-2x= -5+3

x= -2

g)2x+3(-x+1)=5

-2x+2x-3x+3=5

-3x=5-3

-3x=2

x= 2/-3

h)4x-18+3x=10

7x=10+18

7x=28

x=28/7

x=4