Question

18- Resolva as equações.

a) 2x - 4 = 6x

b) 3x - 5 = 2x + 7

c) 3x + 7 = 2x + 8

d) 3x - 8 = 16 - 5x

e) 4x + 13 = -6x + 9

f) 12x - 9 = 3x - 12

POR FAVOR PRECISO HOJE!!!

Answer 1

Resposta:

a) 2x - 4 = 6x

$2x = 6x + 4 \\ 2x - 6x = 4 \\ - 4x = 4 \\ \\ x = - \frac{4}{4} \\ \\ x = - 1$

b) 3x - 5 = 2x + 7

$3x - 5 - 2x = 7 \\ x = 7 + 5 \\ x = 12$

c) 3x + 7 = 2x + 8

$3x + 7 - 2x = 8 \\ x = 8 - 7 \\ x = 1$

d) 3x - 8 = 16 - 5x

$3x - 8 + 5x = 16 \\ 8x = 16 + 8 \\ 8x = 24 \\ \\ x = \frac{24}{8} \\ x = 3$

e) 4x + 13 = -6x + 9

$4x + 13 + 6x = 9 \\ 10x = 9 - 13 \\ 10x = - 4 \\ x = - \frac{4}{10} \div 2 \\ x = - \frac{2}{5}$

f) 12x - 9 = 3x - 12

$12x - 9 - 3x = - 12 \\ 9x = - 12 + 9 \\ 9x = - 3 \div 3 \\ 3x = - 1 \\ x = - \frac{1}{3}$