Question

observe as regras estudadas de equações e resolva a) 2X - 4= 10 b)3X+5=20 c)4X-8=12 d) 7X+8=4x-10 e)4x-15= -2x+3 f) 2x-4-8=4x g)2x+5-5x=-1​

Answer 1

Resposta:

a) 2x - 4 = 10

2x = 10 + 4

2x = 14

x = 14 / 2

x = 7

b) 3x + 5 = 20

3x = 20 - 5

3x = 15

x = 15 / 3

x = 5

c) 4x - 8 = 12

4x = 12 + 8

4x = 20

x = 20 / 4

x = 5

d) 7x + 8 = 4x - 10

7x - 4x = -10 - 8

3x = -18

x = -18 / 3

x = -6

e) 4x - 15 = -2x + 3

4x + 2x = 3 + 15

6x = 18

x = 18 / 6

x = 3

f) 2x - 4 - 8 = 4x

-12 = 4x - 2x

-12 = 2x

x = -12 / 2

x = -6

g) 2x + 5 - 5x = -1

- 3x = -1 - 5

-3x = -6

x = -6 / -3

x = 2