Question

uans d 19.
3. Resolva as seguintes equações do 1° grau:
a) 4x – 8 = 24
e) 8x - 3 = 5x + 6
b) 31 – 3x = x + 3
f) 5. (x – 3) + 5 = 4x - 9
c) 18 - 3. (x - 1) = 0
g) 2x – 1= x + 7
d) 2.(4 – x) + 6 = -6
h) 30 – 5x = x + 12​

Answer 1

Resposta:

a) 8 e) 3 b)7 f) 1 c) 7 g) 8 d) 10 h) 3

Explicação passo-a-passo:

a) 4x-8=24

4x=24+8

4x=32

x=32/4

x=8

e) 8x-3=5x+6

8x-5x=6+3

3x=9

x=9/3

x=3

c) 31-3x=x+3

31-3=x+3x

28=4x

x=28/4

x=7

f) 5. (x-3) + 5=4x-9

5x-15+5=4x-9

5x-4x=-9+15-5

x=-9+10

x=1

c)18-3. (x-1)=0

18-3x-+3=0

21-3x=0

-3x=-21

x=21/3

x=7

g) 2x-1=x+7

2x-x=7+1

x=8

d) 2.(4-x) +6=-6

8-2x+6=-6

2x=-6-6-8

x=20/2

x=10

h) 30-5x=x+12

30-12=x+5x

18=6x

x=18/6

x=3