Question

1) Resolva as equações a seguir: a) 17x − 54 = 65 b) 23x + 66 = −14 − 17x c) 10y − 5. (1 − y) = 3. (2y − 2) − 20 d) (x−5) / (1−2x) = (+6) / (−2)

Answer 1

Resposta:

a) 17x = 65 + 54

17x =119

x = 7

b) 23x + 17x = -14 - 66

40x = -80

x = -2

c) 10y - 5 + 5y = 6y -6 - 20

15y - 5y = 6y - 26

15y - 6y = -26 + 5

9y = -21

y = -7/3

d) não sei

Answer 2

Resposta:

A) x = 7

B) x = -2

c) y = -7/3

d) x = -2/5

Explicação passo-a-passo:

A) 17x - 54 = 65

17x = 65 + 54

17x = 119

x = 7

B) 23x + 66 = -14 - 17x

23x + 17 + 66 = -14

23x + 17x = -14 -66

40x = -14 -66

x = -2

C) 10y -5.(1 - y) = 3. (2y - 2) -20

10y - 5 + 5y = 3 (2y - 2) -20

10y -5 + 5y = 6y -6 - 20

15y - 5 = 6y - 6 - 20

15y - 5 = 6y - 26

15y - 6y - 5 = -26

15y - 6y = -26 + 5

9y = -26 + 5

9y = -21

Y = -7/3

D) (x - 5)/ (1 - 2x) = (+6)/(-2)

x - 5/1 - 2x = 6/ -2. x = 1/2

× - 5/1 - 2x = - 3

x - 5 = - 3 (1 - 2x)

x - 5 = -3 + 6x

x - 6x - 5 = 3

x - 6x = -3 + 5

-5x = -3 + 5

-5x = 2

x= -2/5

x = 1/2

x = -2/5.