Question

1- resolva as equações
A) X - 5 = 8?
B) 3 x = 15?
C) 5 x = 20?
D) 3 x + 10 = 2 x + 12?
E) 4x - 5 = - 6 x + 2?
F) 10 x + 10 = 3 x + 8?
G) 9 x - 1 = 2?
H) 3 x + 4 = 2 x - 1?
I) 6 x - 5 = 8 x + 2?
J) 3 x + 6 = x - 1?
K) 4 x + 9 = + 5?
L) 5 x - 6 = 2 x + 7?
M) 9 x + 6 = 7 x + 1?
N) 3 x + 1 = 12?

Answer 1

Explicação passo-a-passo:

A) X - 5 = 8

x=8+5

x=13

B) 3 x = 15

x=15/3

x=5

C) 5 x = 20

x=20/5

x=4

D) 3 x + 10 = 2 x + 12

3x-2x=12-10

x= 2

E) 4x - 5 = - 6 x + 2

4x+6x=2+5

10x=7

x=7/10

F) 10 x + 10 = 3 x + 8

10x-3x=8-10

7x=-2

x=-2/7

G) 9 x - 1 = 2

9x=2+1

9x=3

x=3/9

x=(3÷3)/(9÷3)

x=1/3

H) 3 x + 4 = 2 x - 1

3x-2x=-1-4

x=-5

I) 6 x - 5 = 8 x + 2

6x-8x=2+5

-2x=7

x=-7/2

J) 3 x + 6 = x - 1

3x-x=-1-6

2x=-7

x=-7/2

K) 4 x + 9 = + 5

4x=5-9

4x=-4

x=-4/4

x=-1

L) 5 x - 6 = 2 x + 7

5x-2x=7+6

3x=13

x=13/3

M) 9 x + 6 = 7 x + 1

9x-7x=1-6

2x=-5

x=-5/2

N) 3 x + 1 = 12

3x=12-1

3x=11

x=11/3