Question

1) Resolva as equações, sendo U = Q:


a) 6 x = 2 x + 16


b) 2 x - 5 = x + 1


c) 2 x + 3 = x + 4


d) 5 x + 7 = 4 x + 10


f) 4 x - 7 = 8 x - 2


g) 2 x + 1 = 4 x - 7


h) 9 x + 9 + 3 x = 15


i) 16 x - 1 = 12 x + 3


j) 3 x - 2 = 4 x + 9

Answer 1

A) 6x=2x+16

6x-2x=16

4x=16

x=16/4

x=4

B) 2 x - 5 = x + 1

2x+x= 5+1

3x=6

x=6/3

x=3

C) 2 x + 3 = x + 4

2x-x= -3+4

x= 1

D)5 x + 7 = 4 x + 10

5x-4x = -7+10

x = 3

F)4 x - 7 = 8 x - 2

4x -8x= 7-2

-4x=5 (x-1)

4x=-5

x=5/4

G)2 x + 1 = 4 x - 7

2x-4x= -7-1

2x=-8

x=-8/2

x=-4

h) 9 x + 9 + 3 x = 15

9x+3x=15+9

12x= 24

x=24/12

x=2

i) 16 x - 1 = 12 x + 3

16x-12x= 3+1

4x=4

x=1

j) 3 x - 2 = 4 x + 9

3x-4x=9+2

x=11