Question

2) Resolva as seguintes equações:
a) 3 + x = 1 b) x – 2 = 2
c) 4x + 5 = 25 d) 5x = 30 + 3x
e) 4x + 10 = 45 – 3x f) 2x – 8 = 10
g) 5x – 6 = 2x + 3 h) 3x + 2x + 1 = 6
i) x + 30 – 6x = – 10 j) 7x – 13 = 9 – 5x

Answer 1

Resposta:

a) 3+x=1

x = 1 -3

x = -2

b) x-2=2

x = 2-2

x=0

c) 4x+5  = 25

4x = 25-5

4x = 20

x = 20 ÷ 4

x = 5

d) 5x-6=2x+3

5x - 2x = 3 +6

3x = 9

x = 3

e) 4x + 10 = 45 – 3x

4x + 3x = 45 - 10

7x = 35

x = 35 ÷ 7

x = 5

f) 2x – 8 = 10

2x = 10 +8

2x = 18

x = 18 ÷ 2

x = 9

g) 5x – 6 = 2x + 3

5x -2x = 3 +6

3x = 9

x = 3

h) 3x + 2x + 1 = 6

5x = 6 - 1

5x = 5

x = 1

i) x + 30 – 6x = – 10

x-6x = -10 -30

7x = -40

x = 40 ÷ 7

x= 5,7

j) 7x – 13 = 9 – 5x

7x + 5x = 9 +13

12x = 22

x = 22÷12

x= 13,75