Question

1 - Resolver as equações do primeiro grau:
a) 8x - 4 = 36
b) 3x + 10 = x + 20
c) 4x + 6 = x + 18
d) 3x - 10 = 2x + 30
e) 7x - 5 = 2x + 20
g) 2x + 8x - 4 = 6x + 8
h) 6x - 30 = X + 40​

Answer 1

Resposta:

a) 8x=36+4

8x=40

x=40/8

x=5

b) 3x-x=20-10

2x=10

x=10/2

x=5

c) 4x-x=18-6

3x=12

x=12/3

x=4

d) 3x-2x=30+10

x=40

e) 7x-2x=20+5

5x=25

x=25/5

x=5

g) 2x+8x-6x=8+4

4x=12

x=12/4

x=3

h)6x-x=40+30

5x=70

x=70/5

x=14

Answer 2

Resposta:

$a)8x - 4 = 36\\8x=36+4\\8x=40\\x=40/8\\x=5$

$b)3x + 10 = x + 20\\3x-x=20-10\\2x=10\\x=10/2\\x=5$

$c)4x + 6 = x + 18\\4x-x=18-6\\3x=12\\x=12/3\\x=4$

$d)3x - 10 = 2x + 30\\3x-2x=30+10\\1x=40\\x=40/1\\x=40$

$e)7x - 5 = 2x + 20\\7x-2x=20+5\\5x=25\\x=25/5\\x=5$

$g) 2x + 8x - 4 = 6x + 8\\10x-6x=8+4\\4x=12\\x=12/4\\x=3$

$h) 6x - 30 = x + 40\\6x-x=40+30\\5x=70\\x=70/5\\x=14$