Question

3) Determine o valor de x, nas seguintes equações: 6x = 2x + 16 2x – 5 = x + 1 2x + 3 = x + 4 5x + 7 = 4x + 10 4x – 10 = 2x + 2 4x – 7 = 8x - 2 2x + 1 = 4x - 7 9x + 9 + 3x = 15

Answer 1

a)6x = 2x + 16

6x - 2x = 16

4x = 16

x=16/4

x=4

b)2x – 5 = x + 1

2x-x=1+5

x=6

c)2x + 3 = x + 4

2x-x=4-3

x=1

d)5x + 7 = 4x + 10

5x-4x=10-7

x=3

e)4x – 10 = 2x + 2

4x-2x=2+10

2x=12

x=12/2

x=6

f)4x – 7 = 8x - 2

4x-8x=7-2

-4x=5

x=5/-4

x=-1,25

g)2x + 1 = 4x - 7

2x-4x=-7-1

-2x=-8

x=-8/-2

x=4

h)9x + 9 + 3x = 15

9x+3x=15-9

12x=6

x=6/12

x=1/2