1. Resolva as seguintes equações:a) 9x – 2 = 4x + 18b) 2x – 10...

resposta:

Explicação passo-a-passo:

a) 9x – 2 = 4x + 18

9x - 4x = 18+2

5x = 20

x = 20/5

x = 4

b) 2x – 10 + 7x + 10 = 180

2x + 7x = 180

9x = 180

x = 180/9

x = 20

c) 7y – 10 = y + 50

7y - y = 50+10

6y = 60

y = 60/6

y = 10

d) 4x – 18 + 3x = 10

7x = 10+18

7x = 28

x = 28/7

x = 4

e) 2x + 5 + x + 7 = 18

3x + 12 = 18

3x = 18-12

3x = 6

x = 6/3

x = 2

f) 5x – 91 = 4x – 77

5x - 4x = - 77 + 91

x = 14

g) 7x + 1 = 5x – 7

7x - 5x = - 7 - 1

2x = - 8

x = - 8/2

x = - 4

h) 4x + 5 = x + 20

4x-x = 20-5

3x = 15

x = 15/3

x = 5