Question

7) Resolvaa as seguintes equaçoes:

a) 2x + 12 = 28
b 6 a - 2a + a = 10
c) y + 2y = 10y + 10 + 4
d) 5 ( m - 2 ) + 3m - 3 = 9 - 2m + 6m
e) n/4 + 3/2 = 10 <----- isso e fraçao
f) 6u + 3u + 10u - 20 = 10
g) 4k + 7 (k+2) = 113 + k + 1
h) 2,5 + g - 0,5 = 5,4 + 2g - 1,4
i) 2/3 (x - 1) + 3/2 = 1//4 (x-3) <----- isso e fraçao tambem

Answer 1

Explicação passo-a-passo:

a) 2x+12=28

2x=28-12

2x= 16

x= 16/2

x=8

b) 6a - 2a + a = 10

4a + a = 10

5a = 10

a = 10/5

a = 2

Answer 2

a) 2x + 12 = 28

2x = 28 - 12 = 16

x = 16/2 = 8

b) 6a - 2a + a = 10

5a = 10

a = 10/5 = 2

c) y + 2y = 10y + 10 + 4

3y = 10y + 14

10y - 3y = -14

7y = -14

y = -14/7 = -2

d) 5 ( m - 2 ) + 3m - 3 = 9 - 2m + 6m

5m - 10 + 3m - 3 = 9 + 4m

8m - 13 = 4m + 9

4m = 22

m = 22/4 = 11/2

e) n/4 + 3/2 = 10

n/4 + 6/4 = 40/4

n/4 = 34/4

n = 34

f) 6u + 3u + 10u - 20 = 10

19u = 10 + 20

u = 30/19

g) 4k + 7 (k+2) = 113 + k + 1

4k + 7k + 14 = 113 + k + 1

10k = 114 - 14

10k = 100

k = 10

h) 2.5 + g - 0.5 = 5.4 + 2g - 1.4

2g - g = 2 - 4

g = -2

i) 2(x - 1)/3 + 3/2 = (x - 3)/4

mmc = 12

8x - 8 + 18 = 3x - 9

8x - 3x = -9 - 10

5x = -19

x = -19/5