Question

3. Resolva as equações. a) x + 4 =12 b) x + 5=9 c) 3x + 5 =8 d) 7x - 2 =12 e) 2 + 6x = 20 f) 5x - 1 =19

Answer 1

Resposta:

a) x + 4 =12

x=12-4

x= 8

b)x+5=9

x= 9-5

x= 4

c) 3x+5=8

3x= 8-5

3x= 3

x= 3/3

x=1

d)7x-2=12

7x=12+2

7x=14

x= 14/7

x=2

e)2+6x=20

6x=20-2

6x= 18

x= 18/6

x=3

f) 5x-1=19

5x=19+1

5x= 20

x= 20/5

x=4