Question

Determine o valor de X das seguintes equações :


a) 4X + 2 = 38

b) 54 = 6X + 12

C) X- 1 = + 11

D) 2X + 8 = 14

E) -9 = 6 + 5X

F) + 7 = - 14 - X

G) 5X + 5 = - 10

H) - 3X + 15 = - 45




Por favor me ajudem!!!​

Answer 1

Explicação passo-a-passo:

$a)4x + 2 = 38 \\ 4x = 38 - 2 \\ 4x = 36 \\ x = \frac{36}{4}$

$x = 9$

$b)54 = 6x + 12 \\ 54 - 12 = 6x \\ 42 = 6x$

$x = \frac{42}{6}$

$x = 7$

$c)x - 1 = 11 \\ x = 11 + 1 \\ x = 12$

$d)2x + 8 = 14 \\ 2x = 14 - 8 \\ 2x = 6 \\ x = \frac{6}{2}$

$x = 3$

$e) - 9 = 6 + 5x \\ - 9 - 6 = 5x \\ - 15 = 5x \\ x = \frac{ - 15}{5}$

$x = - 3$

$f)7 = - 14 - x \\ 7 + 14 = - x \\ 21 = - x \: \: \: \times ( - 1) \\ x = - 21$

$g)5x + 5 = - 10 \\ 5x = - 10 - 5 \\ 5x = - 15 \\ x = \frac{ - 15}{5}$

$x = - 3$

$h) - 3x + 15 = - 45 \\ - 3x = - 45 - 15 \\ - 3x = - 60 \: \: \times ( - 1) \\ 3x = 60 \\ x = \frac{60}{3}$

$x = 20$

Answer 2

A)x=9

B)x=7

C)x=12

D)x=3

E)x=-3

F)x=-21

G)x=-3

H)x=20

Explicação passo a passo

A)4x+2=38

4x+2=38

4x+2-2=38-2

4x=38-2

4x+2=38

4x=38-2

4x=36

4x÷=36÷4

x=36÷4

4x÷4=36÷4

x=9

4x=36

x=9

Resposta

x=9

B)54=6x+12

54=6x+12

54-6x=6x+12-6x

54-6x=12

54=6x+12

54-6x=12

54=6x+12

54-6x-54=12-54

-6x=12-54

54=6x+12

-6x=12-54

12-54

-(54-12)

-42

-6x=12-54

-6x=-42

-6x÷(-6)=-42÷(-6)

x=-42÷(-6)

-6x÷(-6)=-42÷(-6)

x=42÷6

-6x÷(-6)=-42÷(-6)

x=7

-6x=-42

x=7

Resposta

x=7

C)x-1=+11

x-1=+11

x-1+1=11+1

x=11+1

x-1=+11

x=11+1

x=12

Resposta

x=12

D)2x+8=14

2x+8=14

2x+8=14-8

2x=14-8

2x+8=14

2x=14-8

2x=6

2x÷2=6÷2

x=6÷2

2x÷2=6÷2

x=3

2x=6

x=3

Resposta

x=3

E)-9=6+5x.

-9=6+5x

-9-5x=6+5x-5x

-9-5x=6

-9=6+5x

-9-5x=6

-9=6+5x

-9-5x+9=6+9

-5x=6+9

-9=6+5x

-5x=6+9

-5x=15

-5÷(-5)=15÷(-5)

x=15÷(-5)

-5x÷(-5)15÷(-5)

x=-15÷5

-5x÷(-5)=15÷(-5)

x=-3

-5x=15

x=-3

Resposta

x=-3

F)+7=-14-x

7=-14-x

7+x=-14-x+x

7+x=-14

7=-14-x

7+x-7=-14

7+x=-14-x

7+x-7=-14-7

x=--14-7

7=-14-x

x=-14-7

-14-7

-(14+7)

-21

x=-14-7

x=-21

Resposta

x=21

G)5x+5=-10

5x+5=-10

5x+5-5=-10-5

5x=-10-5

5x+5=-10

5x=-10-5

-10-5

-(10+5)

-15

5x=-10-5

5x=-15

5x÷=-15÷5

x=-15÷5

5x÷5=-15÷5

x=-3

5x=-15

x=-3

Resposta

x=-3

H)-3x+15=-45

-3x+15=-45

-3x+15-15=-45-15

-3x=-45-15

-3x+15=-45

-3x=-45-15

-45-15

-(45+15)

-60

-3x=-45-15

-3x=-60

3x÷(-3)=-60+(-3)

x=-60÷(-3)

-3x÷(-3)=-60÷(-3)

x=60÷3

-3x÷(-3)=-60÷(-3)

x=20

-3x=-60

x=20

Resposta da

x=20