Question

Resolva as equações e assinale a resposta correta. a) 2x + 6 = 3x + 4 b)10-5x – 1 = 8x + 8 c) –x+6= 1 - 8 d) -5x + 1 = 6 - 7 e 2x + 6 = 3x + 4 f) x + 2x – 2 = x + 6

Answer 1

a) 2x + 6 = 3x + 4 → 2x - 3x = 4 - 6 → -x = -2 ×(-1) → x = 2

b) 10 - 5x – 1 = 8x + 8 → -5x - 8x = 8 - 10 - 1 → -13x = -3 ×(-1) → 13x = 3 → x = 3

13

c) -x + 6 = 1 - 8 → -x = -7 - 6 → -x = -13 ×(-1) →

x = 13

d) -5x + 1 = 6 - 7 → -5x = -1 - 1 → -5x = -2 ×(-1) → 5x = 2 → x = 2

5

e) 2x + 6 = 3x + 4 → 2x - 3x = 4 - 6 → -x = -2 ×(-1) → x = 2

f) x + 2x – 2 = x + 6 → x + 2x - x = 6 + 2 → 2x = 8 → x = 8 ÷ 2 → x = 4

Espero ter ajudado!!!