Question

1 - Resolva as equações do 1 grau abaixo:

a) X – 3 = 2

b) X - 4 = 4

c) 2 x – 4 = 8

d) X - 5 = 10

e) 3x – 4 = x + 10

f) X = 3 – 6

g) 2x + 3x –x = 8​

Answer 1

Letra A:

$\sf x - 3 = 2 \\ \\ \\ \sf x = 2 + 3 \\ \\ \\ \sf {\color{lime} \underline{x = 5}}$

Letra B:

$\sf x - 4 = 4 \\ \\ \\ \sf x = 4 + 4 \\ \\ \\ \sf {\color{lime} \underline{x = 8}}$

Letra C:

$\sf 2x - 4 = 8 \\ \\ \\ \sf 2x = 8 + 4 \\ \\ \\\sf 2x = 12 \\ \\ \\ \sf x = \frac{12}{2} \\ \\ \\ \sf {\color{lime} \underline{x = 6}}$

Letra D:

$\sf x - 5 = 10 \\ \\ \\ \sf x = 10 + 5 \\ \\ \\ \sf {\color{lime} \underline{x = 15}}$

Letra E:

$\sf 3x - 4 = x + 10 \\ \\ \\ \sf 3x - x = 10 + 4 \\ \\ \\ \sf 2x = 14 \\ \\ \\ \sf x = \frac{14}{2} \\ \\ \\ \sf {\color{lime} \underline{x = 7}}$

Letra F:

$\sf x = 3 - 6 \\ \\ \\ \sf {\color{lime} \underline{x = - 3}}$

Letra G:

$\sf 2x + 3x - x = 8 \\ \\ \\ \sf 5x - x = 8 \\ \\ \\ \sf 4x = 8 \\ \\ \\ \sf x = \frac{8}{4} \\ \\ \\ \sf {\color{lime} \underline{x = 2}}$

Att: Nerd1990