Question

Resolva as equações do primeiro grau:
A) 10x-20=x+1
B)8x-1-4x=6
C)6x-21=5x+10
D)15x=12x+2x-4
E)5x-15-8x+4=100
F)10x-5=15x-3x+3
G)x+6x-4=2x-6
H)10x-10=9x+18

Answer 1

a)
10x-20=x+1
10x-x=1+20
9x=21
x=21/9
x= 2,3

b)
8x-1-4x=6
8x-4x=6+1
4x=7
x=7/4
x=1,75

Answer 2

A)

10x-20 = x+1

10x-x = 1+20

9x = 21

 x = 21/9

x = 7/3 → Resposta:)

B)

8x-1-4x = 6

4x = 6+1

  x = 7/4 → Resposta:)

C)

6x-21 = 5x+10

6x-5x = 10+21

x = 31 → Resposta:)

D)

15x = 12x+2x-4

15x = 14x-4

15x-14x = -4

x = -4 → Resposta:)

E)

5x-15-8x+4 = 100

3x-11 = 100

3x = 100+11

  x = 111/3

  x = 37 → Resposta:)

F)

10x-5 = 15x-3x+3

10x = 12x+5+3

10x-12x = 8

-2x = 8

  x = 8/-2

  x = -4 → Resposta:)

G)

x+6x-4 = 2x-6

7x = 2x-6+4

7x-2x = -2

5x = -2

 x = -2/5 → Resposta:)

H)

10x-10 = 9x+18

10x-9x = 18+10

x = 28 → Resposta:)