Question

3) Resolva as seguintes equações:
a) x + 10 = 25
b) y -15 = 30
c) 3x – 6 = x – 2
d) -5y + 8 = -10y +13

Answer 1

Resposta:

Alínea a)

x + 10 = 25

=> x = 25 - 10

=> x = 15

Alínea b)

y - 15 = 30

=> y = 30 + 15

=> y = 45

Alínea c)

3x - 6 = x - 2

=> 3x - x = - 2 + 6

=> 2x = 4

=> x = 4/2

=> x = 2

Alínea d)

- 5y + 8 = - 10y + 13

=> - 5y + 10y = 13 - 8

=> 5y = 5

=> y = 5/5

=> y = 1