Question

equações de 1 grau

A) 3x-4x+9=-8x+3

B) 9x-4x=25

C)3x-4+2x=2(x+1)

D)9x-4=-3+2(4-x)

E)2x+3x-9x+4-3=-2+3

Answer 1

A) 3x-4x+9=-8x+3
3x-4x+8x=3-9
7x=-6
x=-6/7

B) 9x-4x=25
5x=25
x=25/5
x=5

C) 3x-4+2x=2(x+1)
3x-4+2x=2x+2
3x+2x-2x=2+4
3x=6
x=6/3
x=2

D) 9x-4=-3+2(4-x)
9x-4=-3+8-2x
9x+2x=-3+8+4
11x=9
x=9/11

E) 2x+3x-9x+4-3=-2+3
2x+3x-9x=-2+3-4+3
14x=0
x=0/14
x=0

Espero ter ajudado!

Answer 2

Respostas:

A) 3x - 4x + 9 = - 8x + 3

......3x - 4x + 8x = 3 - 9

......7x = -6

......x = - 6/7.............................S = {- 6/7}

B) 9x - 4x = 25

5x = 25

x = 25 : 5

x = 5..................................S = { 5 }

C) 3x - 4 + 2x = 2.(x + 1)

3x + 2x - 4 = 2x + 2

5x - 2x = 2 + 4

3x = 6

x = 6 : 3

x = 2...................................S = { 2 }

D) 9x - 4 = -3 + 2.(4 - x)

9x - 4 = - 3 + 8 - 2x

9x + 2x = 5 + 4

11x = 9

x = 9/11..............................S = { 9/11}

E) 2x + 3x - 9x + 4 - 3 = - 2 + 3

5x - 9x + 1 = 1

- 4x = 1 - 1

- 4x = 0

x = 0..............................S = { 0 }