Question

3) Resolva as equações abaixo:
a) 7x – 1 = 13
b) 35x = - 105
c) 3x + 3 = 0
d) x + 5 = 8
e) 2x + 3 = 15
f) 9x = 18
g) 48x = 12
h) 10x - 1 = 4 + 5​

Answer 1

Resposta:

a) 7x – 1 = 13

7x=13+1

7x=14

x=14/7 x=2

b) 35x = - 105

x=-105/35

x=-3

c) 3x + 3 = 0

x=-3/3=-1

d) x + 5 = 8

x=8-5

x=3

e) 2x + 3 = 15

2x=15-3

x=12/2=6

f) 9x = 18

x=18/3= 2

g) 48x = 12

x=12/48

x= 0,25

h) 10x - 1 = 4 + 5

10x=4+5+1

10x=10​

x=10/10=1

Answer 2

Resposta: a) 2 b) 3.85 c) -1 d) 3 e) 6 f) -2 g) -0,25 h) 1

Solução:

a) 7x – 1 = 13

7x = 13 + 1 -> 7x = 14 -> x = 14/7 -> x=2

b) 35x = - 105

x = -135/-35 -> x = 3.85

c) 3x + 3 = 0

3x = 0 - 3 -> x = 3/-3 -> x=-1

d) x + 5 = 8

x = 8 - 5 -> x = 3

e) 2x + 3 = 15

2x = 12 - > 12/2 = 6

f) 9x = 18

x = 18/-9 -> x = -2

g) 48x = 12

x = 12 / -48 -> x = -0,25

h) 10x - 1 = 4 + 5​

10x = 10

x = 10/10 -> x = 1