Question

resolva as equações do 1º grau:

A) 2 x + 9 = 11

B) 5 x + 20 = 45

C) x + 8 = 2x - 10

D) x + 12 = 30

E) 24 - x = 2x

F) x + 2x = 60

G) 7 x - 5x = 80

H) 3 x + 1 = - x + 5

I) 4 x = 10

J) 7 x - 10 = 39 ​

Answer 1

Resposta:

A) 2 x + 9 = 11

2x=11-9

2x=2

x=2/2

X=1

B) 5 x + 20 = 45

5x=45-20

5x=25

X=25/5

X=5

C) x + 8 = 2x - 10

X-2x=-10-8

-x=-18 .(-1)

X=18

D) x + 12 = 30

X=30+12

X=42

E) 24 - x = 2x

-x-2x=-24

-3x=-24 .(-1)

3x=24

X=24/3

X=8

F) x + 2x = 60

3x=60

X=60/3

X=20

G) 7 x - 5x = 80

2x=80

X=80/2

X=40

H) 3 x + 1 = - x + 5

3x+x= 5-1

4x=4

X=4/4

X=1

I) 4 x = 10

X=10/4

X=2,5

J) 7 x - 10 = 39

7x=39+10

7x=49

X=49/7

X= 7

Espero ter ajudado♡

Answer 2

Explicação passo-a-passo:

a) 2x + 9 = 11

2x = 11 - 9

2x = 2

x = 2 / 2

x = 1

b) 5x + 20 = 45

5x = 45 - 20

5x = 25

x = 25 / 5

x = 5

c) x + 8 = 2x - 10

x - 2x = - 10 - 8

x = -18 • (-1)

x = 18

d) x + 12 = 30

x = 30 - 12

x = 18

e) 24 - x = 2x

-x - 2x = -24

3x = -24 • (-1)

3x = 24

x = 24 / 3

x = 8

f) x + 2x = 60

3x = 60

x = 60 / 3

x = 20

g) 7x - 5x = 80

2x = 80

x = 80 / 2

x = 40

h) 3x + 1 = -x + 5

3x + x = 5 - 1

4x = 4

x = 4 / 4

x = 1