Question

1) Resolva as equações do 1° grau:
a) 2x + 3 = 7
b) 5x - 4 = 26
c) y = 8 + 3y
d) 15 - 9x = 6
e) 4x + 26 = 8 - 5x
f) 2x - x = 10
g) 2(7 + 5x) = 9x - 4
h) x + 3x = 10 - 2
i) 7(x + 3) - 10 = 3x + 5(x - 2 )
j) 5(x + 3) - 8 = 3x + 3(x + 4)
k) 3(x + 2) = 2x
l) 10 - 2x = 12
m) 2(2x - 1) = 6
n) 5x - 3 = 4x
o) 6x + 4 = 5x + 10
p) 3(x + 2) = 7
q) 4(x - 2) = x + 7


agradeço muuuito quem conseguir me ajudar!!

Answer 1

Oie, Td Bom?!

a)

2x + 3 = 7

2x = 7 - 3

2x = 4

x = 4/2

x = 2

b)

5x - 4 = 26

5x = 26 + 4

5x = 30

x = 30/5

x = 6

c)

y = 8 + 3y

y - 3y = 8

- 2y = 8 . (- 1)

2y = - 8

y = - 8/2

y = - 4

d)

15 - 9x = 6

- 9x = 6 - 15

- 9x = - 9 . (- 1)

9x = 9

x = 9/9

x = 1

e)

4x + 26 = 8 - 5x

4x + 5x = 8 - 26

9x = - 18

x = - 18/9

x = - 2

f)

2x - x = 10

x = 10

g)

2(7 + 5x) = 9x - 4

14 + 10x = 9x - 4

10x - 9x = - 4 - 14

x = - 18

h)

x + 3x = 10 - 2

4x = 8

x = 8/4

x = 2

i)

7(x + 3) - 10 = 3x + 5(x - 2)

7x + 21 - 10 = 3x + 5x - 10

7x + 21 = 3x + 5x

7x + 21 = 8x

7x - 8x = - 21

- x = - 21 . (- 1)

x = 21

j)

5(x + 3) - 8 = 3x + 3(x + 4)

5x + 15 - 8 = 3x + 3x + 12

5x + 7 = 6x + 12

5x - 6x = 12 - 7

- x = 5 . (- 1)

x = - 5

k)

3(x + 2) = 2x

3x + 6 = 2x

3x - 2x = - 6

x = - 6

l)

10 - 2x = 12

- 2x = 12 - 10

- 2x = 2 . (- 1)

2x = - 2

x = - 2/2

x = - 1

m)

2(2x - 1) = 6

2x - 1 = 6/2

2x - 1 = 3

2x = 3 + 1

2x = 4

x = 4/2

x = 2

n)

5x - 3 = 4x

5x - 4x = 3

x = 3

o)

6x + 4 = 5x + 10

6x - 5x = 10 - 4

x = 6

p)

3(x + 2) = 7

3x + 6 = 7

3x = 7 - 6

3x = 1

x = 1/3

q)

4(x - 2) = x + 7

4x - 8 = x + 7

4x - x = 7 + 8

3x = 15

x = 15/3

x = 5

Att. Makaveli1996