Question

Equação de primeiro grau

Answer 1

a) x + 7 = 14

x = 14 - 7

x = 7

b) x - 3 = 2

x = 2 + 3

x = 5

c) 3x + 9 = 27

3x = 27 - 9

3x = 18

x = 18 / 3

x = 6

d) 5x - 3 = 17

5x = 17 + 3

5x = 20

x = 20 / 5

x = 4

e) 2x + 6 = - 2x - 2

2x + 2x = - 2 - 6

4x = - 8

x = - 8 / 4

x = - 2

f) 5x - 3 = 3x + 11

5x - 3x = 11 + 3

2x = 14

x = 14 / 2

x = 7

g) 5x = 2x + 3

5x - 2x = 3

3x = 3

x = 3 / 3

x = 1

h) 5 (- x - 7) = 6 - 4x + 8

- 5x - 35 = 6 - 4x + 8

- 5x + 4x = 6 + 8 + 35

- x = 49

x = - 49

Answer 2

Resposta:

$a)x+7=14\\x=14-7\\x=7$

$b)x-3=2\\x=2+3\\x=5$

$c)3x+9=27\\3x=27-9\\3x=18\\x=18/3\\x=6$

$d)5x-3=17\\5x=17+3\\5x=20\\x=20/5\\x=4$

$e)2x+6=-2x-2\\2x+2x=-2-6\\4x=-8\\x=-8/2\\x=-2$

$f)5x-3=3x+11\\5x-3x=11+3\\2x=14\\x=14/2\\x=7$

$g)5x=2x+3\\5x-2x=3\\3x=3\\x=3/3\\x=1$

$h)5(-x-7)=6-4x+8\\-5x-35=14-4x\\-5x+4x=14+35\\-1x=49\\x=49/(-1)\\x=-49$