Question

urgente 2. Calcule o valor do x em cada equação: a) 7x – 3x = 28 b) – 9x + 5x = 44 c) 4x + 19 = - 2x – 35 d) x/8 = 9 e) 16x + 8 = 14x + 48 f) – 12x + 18 = -2x – 42 g) – 3x – 17 = 4x + 32 h) 6x – 8 = 3x + 22 i) 2x/4 = 12 j) 4 ( 2x – 7 ) = 12

Answer 1

Resposta:

a) 7x – 3x = 28

4x = 28

x = $\frac{28}{4}$ = 7

x = 7

b) – 9x + 5x = 44

-4x = 44

x = $\frac{44}{-4}$ = - 11

x = -11

c) 4x + 19 = - 2x – 35

4x + 2x = -35 -19

6x = -54

x = $\frac{-54}{6} = -9$

x = -9

d) x/8 = 9

x = 9*8

x = 72

e) 16x + 8 = 14x + 48

16x - 14x = 48 - 8

2x = 40

x = $\frac{40}{2} = 20$

x = 20

f) – 12x + 18 = -2x – 42

-12x + 2x = -42 -18

-10x = -60

x = $\frac{-60}{-10} = 6$

x = 6

g) – 3x – 17 = 4x + 32

-3x - 4x = 32 + 17

-7x = 49

x = $\frac{49}{-7}$ = -7

x = -7

h) 6x – 8 = 3x + 22

6x - 3x = 22 + 8

3x = 30

x = $\frac{30}{3}$ = 10

x = 10

i) 2x/4 = 12

2x = 12 * 4

2x = 48

x = $\frac{48}{2} = 24$

x = 24

j) 4 ( 2x – 7 ) = 12

6x - 28 = 12

6x = 12 + 28

6x = 40

x = $\frac{40}{6}$ = 6,666666666666667‬

x = 6,666666666666667‬

Explicação passo-a-passo: