Question

1. Resolva as equações abaixo:
a) 2x - 20 = 4x +40
b) 3x + 60 = x +120
c) 4x - 30 = 2x + 90
d) 2x - 90 = 4x - 180​

Answer 1

Oie, Td Bom?!

a)

2x - 20 = 4x + 40

2x - 4x = 40 + 20

- 2x = 60

x = 60/-2

x = - 60/2

x = - 30

b)

3x + 60 = x + 120

3x - x = 120 - 60

2x = 60

x = 60/2

x = 30

c)

4x - 30 = 2x + 90

4x - 2x = 90 + 30

2x = 120

x = 120/2

x = 60

d)

2x - 90 = 4x - 180

2x - 4x = - 180 + 90

- 2x = - 90

x = - 90/-2

x = 90/2

x = 45

Att. Makaveli1996