Question

Resolva as equações do primeiro grau:

A) x+3=8
B) x-6=2
C) 3x6=12
D) 4x-7=21
E) x-7=15
F) x-5= -7
G) 5x-1= -16
H) 13x+2= -24
I) 3x+2= 2x+5
J) 6x-4= 3x+2
K) -2x+8= 3x-2
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Answer 1

Explicação passo-a-passo:

A) x = 8 - 3 => *x = 5*

B) x = 2 + 6 => *x = 8*

C) 3x = 12 - 6 => 3x = 6 =>

x = 6/3 => *x = 2*

D) 4x = 21 + 7 => 4x = 28 =>

x = 28/4 => *x = 7*

E) x = 15 + 7 => *x = 8*

F) x = -7 + 5 => *x = -2*

G) 5x = -16 + 1 => 5x = -15 =>

x = -15/5 => *x = -3*

H) 13x = -24 -2 => 13x = -26 =>

x = -26/13 => *x = -2*

I)6x - 3x = 2 + 4 => 3x = 6 =>

x = 6/3 => *x = 2*

J) 6x + 3x = 2 + 4 => 9x = 6 => *x = 6/9*

K) 8 + 2 = 3x + 2x => 10 = 5x =>

x = 10/5 => *x = 2*

Answer 2

Resposta:

a) x+3=8

x= 8-3

x=5

b) x-6=2

x= 2+6

x= 8

c) 3x6=12

3x=12-6

3x=6

x=6/3 > x=2

d) 4x-7=21

4x=21+7

4x=28

x=28/4 > x= 7

e)x-7=15

x=15+7

x=22

f) x-5=-7

x= -7+5

x= -2

g) 5x-1=-16

5x=-16+1

5x=-15

x=-15/5 > x=-3

h) 13x+2=-24

13x=-24-2

13x=-26

x= 26/13 > x= -2

i) 3x+2=2x+5

3x-2x=+5-2

x=3

j) 6x-4=3x+2

6x-3x=+2+4

3x= 6

x= 6/3 > x= 2

k) -2x+8=3x-2

-2x-3x=-2-8

-5x= 2-8

-5x=-10

x= -10/-5 > x= -2