Question

2. Resolva as equações do 1° grau
a) 3x - 10 = 2x + 5
b) X-9 + 4x = - 7x + 6x + 15
c) 13+4(2x - 1) = 5(x + 2)​

Answer 1

Resposta:

$a)3x - 10 = 2x + 5 \\ = > 3x - 2x = 5 + 10 = > x = 15. \\ b)x - 9 + 4x = - 7x + 6x + 15 \\ = > 5x - 9 = - x + 15 \\ = > 6x = 24 = > x = \frac{24}{6} = 4.\\ c)13 + 4(2x + 1) = 5(x + 2) \\ = > 13 + 8x + 4 = 5x + 10 \\ = > 17 + 8x = 5x + 10 \\ = > 3x = - 7 = > x = - \frac{7}{3}$