Question

5) Resolva as equações de 1º grau.

a) 2x + 4 = 12
c) 5x + 3x = 32
e) 2(2x + 3) = 22
b) m/2 – 5 = 7
d) 9m – 2 = 6m + 28
f) 4m – 8 = 2(m + 7)

Me ajudem é urgente!!!​

Answer 1

Olá,

a)

$2x + 4 = 12$

$2x = 12 - 4$

$2x = 8$

$x = \frac{8}{2}$

$x = 4$

b)

$5x + 3x = 32$

$8x = 32$

$x = \frac{32}{8}$

$x = 4$

c)

$2(2x + 3) = 22$

$2x + 3 = \frac{22}{2}$

$2x + 3 = 11$

$2x = 11 - 3$

$2x = 8$

$x = \frac{8}{2}$

$x = 4$

d)

$\frac{m}{2} - 5 = 7$

$\frac{m}{2} = 7 + 5$

$\frac{m}{2} = 12$

$m = 24$

e)

$9m - 2 = 6m + 28$

$9m - 6m = 28 + 2$

$3m = 30$

$m = \frac{30}{3}$

$m = 10$

f)

$4m - 8 = 2(m + 7)$

$4m - 8 = 2m + 14$

$4m - 2m = 14 + 8$

$2m = 22$

$m = \frac{22}{2}$

$m = 11$