Question

1 – Resolva as equações do 1° grau:
a) 2x – 18 = 2

b) 5x + 3 = 38

c) 6x - 4 = 3x + 20

d) 7x + 12 = 3x – 20

Answer 1

Explicação:

$a) 2x - 18 = 2\\2x = 2 + 18\\\2x = 20$

$x= \frac{20}{2} \\x = 10$

$b) 5x + 3 = 38$

$5x = 38 - 3$

$5x = 35$

$x = \frac{35}{5}$

$x = 7$

$c) 6x - 4 = 3x + 20$

$6x - 3x = 20 + 4$

$3x = 24$

$x = \frac{24}{3}$

$x = 8$

$d) 7x + 12 = 3x - 20$

$7x - 3x = -20 - 124x = -32$

$x = \frac{-32}{4}$

$x = -8$

Answer 2

Oie, Td Bom?!

a)

2x - 18 = 2

2x = 2 + 18

2x = 20

x = 20/2

x = 10

b)

5x + 3 = 38

5x = 38 - 3

5x = 35

x = 35/5

x = 7

c)

6x - 4 = 3x + 20

6x - 3x = 20 + 4

3x = 24

x = 24/3

x = 8

d)

7x + 12 = 3x - 20

7x - 3x = - 20 - 12

4x = - 32

x = - 32/4

x = - 8

Att. Makaveli1996