Question

Y
Resolva as equações.
a) 7y +5 – y + 8 = 31
b) 5.(3 - 2a) = 55
c) 27 = 3.(x+3)
d) 16x + 2 (7x+8) - 9:= 67
e) 6.(4x + 2) + 7:(-52 + 3) = 66
f) 12+(3x + 6).(-7) – 5 = 70​

Answer 1

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

6y = 18

18 ÷ 6 = 3

y = 3

b) 3 - 2a = 55 ÷ 5

2a = 11 + 3

2a = 14

14 ÷ 2 = 7

a = 7

c) 27 ÷ 3 = x + 3

9 - 3 = x

x = 6

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

16x . (7x + 8) = 74

16x . 7x = 74 - 8

16x . 7x = 66

(16 . x) . (7 . x) = 66

16 . 7 = 66 ÷ x ÷ x

112 = 66 ÷ x ÷ x

112 . x = 66 ÷ x

desculpa, mas ficarei devendo esse

e) 6 . (4x + 2) + 7 ÷ (-52 + 3) = 66

(4x + 2) ÷ -49 = 66 ÷ 6 - 7

4x ÷ -49 = 4 - 2

4x = 2 . -49

4x = -98

-98 ÷ 4 = -245

x = -245

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

3x . -7 - 5 = 70 - 12 - 6

3x . -7 = 52 + 5

3x = 57 ÷ -7

3x = -8,1

8,1 ÷ 3 = 2,7

x = 2,7