Question

resolva as equações

A) 16x-1=12x+3
B)9x+9+3x=15
C)2x+1=4x-7
D)2x=14
E)4x=-12
F)7x=21
G)13x=13

Answer 1

a) 16x - 1 = 12x + 3
    16x - 12x = 3 + 1
    4x = 4
    x = 4/4
    x = 1

b) 9x + 9 + 3x = 15
    9x + 3x = 15 - 9
    12x = 6
    x = 6/12
    x = 1/2

c) 2x + 1 = 4x - 7
    4x - 2x = 7 + 1
    2x = 8
    x = 8/2
    x = 4

d) 2x = 14
    x = 14/2
    x = 7

e) 4x = -12
    x = -12/4
    x = -3

f) 7x = 21
   x = 21/7
   x = 3

g) 13x = 13
    x = 13/13
    x =1

Answer 2

Oie, Td Bom?!

a)

16x - 1 = 12x + 3

16x - 12x = 3 + 1

4x = 4

x = 4/4

x = 1

b)

9x + 9 + 3x = 15

12x + 9 = 15

12x = 15 - 9

12x = 6

x = 6/12

x = 6÷6/12÷6

x = 1/2

c)

2x + 1 = 4x - 7

2x - 4x = - 7 - 1

- 2x = - 8

x = -8/-2

x = 8/2

x = 4

d)

2x = 14

x = 14/2

x = 7

e)

4x = - 12

x = - 12/4

x = - 3

f)

7x = 21

x = 21/7

x = 3

g)

13x = 13

x = 13/13

x = 1

Att. Makaveli1996