Question

Resolva as equação de 1 grau: a)2x+8=x+13
b)4x+2=38 (c) 5x-1=3x+11 (d) 9x=6x+12 ​

Answer 1

Resposta:

$a) \: 2x + 8 = x + 13 \\ 2x + 8 - x = 13 \\ 2x - x = 13 - 8 \\ x = 5$

$b) \: 4x + 2 = 38 \\ 4x = 38 - 2 \\ 4x = 36 \\ \\ x = \frac{36}{4} \\ \\ x = 9$

$c) \: 5x - 1 = 3x + 11 \\ 5x - 1 - 3x = 11 \\ 5x - 3x = 11 + 1 \\ 2x = 12 \\ \\ x = \frac{12}{2} \\ \\ x = 6$

$d) \: 9x = 6x + 12 \\ 9x - 6x = 12 \\ 3x = 12 \\ \\ x = \frac{12}{3} \\ \\ x = 4$