Question

Outra ajuda
Resolva as equações
a) X+5=15
b) 2x-1=6
c) 3x+1=5x+7
d) 4x+5=15+2x
e) 5x-1=9
f) 20+x=20
g) 15=3x-12
h) 8x-3=10x
i) 10x-9-4x=0

Answer 1

Olá...

a)

x + 5 = 15

x = 15 - 5

x = 10

b)

2x - 1 = 6

2x = 6 + 1

2x = 7

x = 7/2

c)

3x + 1 = 5x + 7

3x - 5x = 7 - 1

- 2x = 6 ( - 1)

2x = - 6

x = - 6/2

x = - 3

d)

4x + 5 = 15 + 2x

4x - 2x = 15 - 5

2x = 10

x = 10/2

x = 5

e)

5x - 1 = 9

5x = 9 + 1

5x = 10

x = 10/5

x = 2

f)

20 + x = 20

x = 20 - 20

x = 0

g)

15 = 3x - 12

- 3x = -12 - 15

- 3x = - 27 (- 1)

3x = 27

x = 27/3

x = 9

h)

8x - 3 = 10x

8x - 10x = 3

- 2x = 3 (- 1)

2x = - 3

x = - 3/2

i)

10x - 9 - 4x = 0

6x = 9

x = 9/6 ÷ 3

x = 3/2

Espero ter ajudado