Question

Resolva as equações a seguir:

a) 7x-28=2x+7

b) 18x-100=8x+200

c) 3x-4=2x+8

d) 5x+7=4x+10

Pfv me ajudem é pra amanha

Answer 1

Olá....

a)

7x - 28= 2x + 7

7x - 2x= 7 + 28

5x= 35

x= 35/5

x= 7

b)

18x - 100= 8x + 200

18x - 8x= 200 + 100

10x= 300

x= 300/10

x= 30

c)

3x - 4= 2x + 8

3x - 2x= 8 + 4

1x= 12

x= 12/1

x= 12

d)

5x + 7= 4x + 10

5x - 4x= 10 - 7

1x= 3

x= 3/1

x= 3

Answer 2

$a) \\ 7x - 28 = 2x + 7 \\ 7x - 2x = 7 + 28 \\ 5x = 35 \\ x = \frac{35}{5} \\ x = 7 \\ \\ b) \\ 18x - 100 = 8x + 200 \\ 18x - 8x = 200 + 100 \\ 10x = 300 \\ x = \frac{300}{10} \\ x = 30 \\ \\ c) \\ 3x - 4 = 2x + 8 \\ 3x - 2x = 8 + 4 \\ x = 12 \\ \\ d) \\ 5x + 7 = 4x + 10 \\ 5x - 4x = 10 - 7 \\ x = 3$