Question

05-Resolva as equações abaixo:
a) X-3 = 9
b) 4x - 9 = 1 - 2x
c) x + 5 = 20 - 4x
d) x + 5 = 20 - 4x
d) 9x - 4x + 10 = 7x - 30​

Answer 1

→ Cálculo :

A) x - 3 = 9

x = 9 + 3

x = 12

B) 4x - 9 = 1 - 2x

4x + 2x = 1 + 10

6x = 10

x = 10/6

x = 5/3

C) x + 5 = 20 - 4x

x + 4x = 20 - 5

5x = 15

x = 15 ÷ 5

x = 3

D) x + 5 = 20 - 4x

x + 4x = 20 - 5

5x = 15

x = 15 ÷ 5

x = 3

D) 9x - 4x + 10 = 7x - 30​

5x + 10 = 7x - 30

5x - 7x = - 30 - 10

-2x = -40

x = 40 ÷ 2

x = 20

Answer 2

Resposta:

a) X-3=9

x=9+3

x=12

b)4.x-9=1-2.x

4.x+2.x=1+9

6.x=10

x=10/6 ÷2

x=5/3

c)x+5=20-4.x

x+4.x=20-5

5.x=15

x=15/5

x=3

d)9.x-4.x+10=7.x-30

5.x+10=7.x-30

5.x-7.x=-30-10

-2.x=-40 .(-1)

2.x=40

x=40/2

x=20

Explicação passo-a-passo: