Question

Resolva as equações do 1°grau:
$a) 2x + 3 = 9\\ b)x + 5 = 15 \\ c)3x = 21 \\ d)2x + 2 = x + 5$
(Resolva corretamente!❤ Melhor resposta )​

Answer 1

Resposta:

1. 2x+3=9      2x=9-3      2x=6   x=3
2. x+5=15       x=15-5       x=10

    3. 3x=21         x=7

    4.   2x+2=x+5  2x-x=5-3   x=3

Explicação passo-a-passo:

Answer 2

a)

$\color{blue}{2x + 3 = 9} \\ \color{blue}{2x = 9 - 3} \\ \color{blue}{2x = 6} \\ \color{blue}{x = \frac{6}{2} = 3}\color{green}{\checkmark}$

b)

$</p><p>\color{blue}{x + 5 = 15} \\ </p><p>\color{blue}{x = 15 - 5} \\ </p><p>\color{blue}{x = 10}\color{green}{\checkmark}$

c)

$</p><p>\color{blue}{3x = 21} \\ </p><p>\color{blue}{x = \frac{21}{3}} \\ </p><p>\color{blue}{x = 7}\color{green}{\checkmark}$

d)

$</p><p>\color{blue}{2x + 2 = x + 5} \\ </p><p>\color{blue}{2x - x = 5 - 2} \\ </p><p>\color{blue}{x = 3}\color{green}{\checkmark}$