Question

Resolva as equacoes:

a) 3x-5=x+20
b) 5a+24-a=-2a+12
c) 2x+2-10=-x+40
d) 10y-32=6y

Answer 1

Resposta:

a) x = 25/2

b) a = -2

c) x = 48

d) x = 8

Explicação passo-a-passo:

Letra a)

$3x - 5 = x + 20 \\ 3x - x = 20 + 5 \\ 2x = 25 \\ x = \frac{25}{2}$

Letra b)

$5a + 24 - a = - 2a + 12 \\ 5a - a + 2a = 12 - 24 \\ 6a = - 12 \\ a = - \frac{12}{6} \\ a = - 2$

Letra c)

$2x + 2 - 10 = x + 40 \\ 2x - x = 40 - 2 + 10 \\ x = 48$

Letra d)

$10y - 32 = 6y \\ 10y - 6y = 32 \\ 4y = 32 \\ y = \frac{32}{4} \\ y = 8$