Question

1.Vamos resolver as seguintes equações do 1º grau, sendo U = Q: a) 5x = 40 b) 6x = -2x + 24 c) 5x + 1 = 3 + 28 d) 7p – 5p = - 18 e) 13y = 169 f) 9t – 14 = 7t + 20 g) 5 – a – 11 = 4a – 22 h) 2y + 21 – 6y = - 12 + y – 7 i) 3(x – 2) – (1 – x) = 13 j) 6(4 – t) – 55 = - 5(2t+ 3)

Answer 1

a- 5x = 40

x = 40 : 5

x = 8

b- 6x = -2x + 24

6x + 2x = 24

8x =24

x = 24 : 8

x = 3

c- 5x + 1 = 3 + 28

5x = 31 - 1

5x = 30

x = 30 : 5

x = 6

d- 7p - 5p = -18

2p = -18

p= -18 : 2

p= -9