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

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 = 0

d) 7x - 2 = 12
7x = 12-2
7x = 10
x = 10/7

e) 2 + 6x = 20
6x = 20-2
6x = 18
x = 18/6
x = 3

f) 5x - 1 = 19
5x = 19+1
5x = 20
x = 4