Question

Resolva as equações:

a ) 7 y + 5 - y + 8 = 31

b) 5. ( 3- 2 a ) = 55

c) 27 = 3. (× + 3 )

d) 16 × + 2 . ( 7 × + 8) - 9 = 67

e) 6. ( 4 z +2 ) +7 . ( 5 z + 3 = 66)

f) 12+ (3×+6). (-7) - 5 = 70

Answer 1

Olá,

a) 7 y + 5 - y + 8 = 31

7y - y = 31 - 5 - 8

6y = 18

y = 18/6

y = 3

b) 5.(3 - 2a) = 55

15 - 10a = 55

-10a = 55 - 15

-10a = 40 (-1)

10a = -40

a = -40/10

a = -4

c) 27 = 3.(x + 3)

27 = 3x + 9

27 - 9 = 3x

18 = 3x

x = 18/3

x = 6

d) 16x + 2.(7x + 8) - 9 = 67

16x + 14x + 16 - 9 = 67

16x + 14x = 67 - 16 + 9

30x = 60

x = 60/30

x = 2

e) 6.(4z + 2) + 7.(5z + 3) = 66)

24z + 12 + 35z + 21 = 462

24z + 35z = 462 - 12 - 21

59z = 429

z = 429/59

z = 7,27

f) 12 + (3x + 6).(-7) - 5 = 70

12 - 21x - 42 - 5 = 70

-21x = 70 - 12 + 42 + 5

-21x = 105 (-1)

21x = -105

x = -105/21

x = -5

Espero ter ajudado!!!