Question

Resolva as equações do 1° grau.

a) 3x +2x=150

b) 4x -5 = 2x +75

c) 9x - 5x=88

d) 4x-6x = 5x + 80

e) 2x + 4x -15 = 2x + 85

f) 2x + 3x + 10= x+42


​

Answer 1

a) 3x +2x=150

5x = 150

x = 150/5

x = 30

b) 4x -5 = 2x +75

4x - 2x = 75 + 5

2x = 80

x = 80/2

x = 40

 

c) 9x - 5x=88

4x = 88

x = 88/4

x = 22

 

d) 4x-6x = 5x + 80

4x - 6x - 5x = 80

4x - 11x = 80

- 7x = 80

x = - 80/7

x = 11,42

 

e) 2x + 4x -15 = 2x + 85

2x + 4x - 2x = 85 + 15

4x = 100

x = 100/4

x = 25

 

f) 2x + 3x + 10= x+42

2x + 3x - x = 42 - 10

4x = 32

x = 32/4

x = 8

Cuide-se :)

Answer 2

Explicação passo-a-passo:

a) 3x +2x=150

6x÷150=25 x=25

b) 4x -5 = 2x +75

2x=-5-75=80

2x=80 2÷80=40 x=40

c) 9x - 5x=88

-14x=88

14÷88=0,159.. valor do x =-0,159..

d) 4x-6x = 5x + 80

5x=80

80÷5=16

x=-16

e) 2x + 4x -15 = 2x + 85

4x=-15 -85=100

100÷4=25 x=25

f) 2x + 3x + 10= x+42

4x=10-42

4÷32=8 x=-8