Question

A)×-4=3
B)×+6=5
C)×-3=-7
D)×+9=-1
E)×+28=11

2
A)6×=2×+16
B)2×-5=×+1
C)2×+3=×+4
D)5×+7=4×+10

3
A)2×+5-5×=-1
B)5+6×=5×+2
C)×+2×-1-3=×
D)-3×+10=2×+8+1

Answer 1

Vamos lá, trata-se de equações do 1° grau. 
A)×-4=3 
X= 3+4
X=7

B)×+6=5
X= 5-6
X= -1


C)×-3=-7
X= -7+3
X= -4

D)×+9=-1
X= -1-9
X= -10

E)×+28=11
X= 11-28
x= -17

A)6×=2×+16

6x-2x= 16
x=16/4
x=4

B)2×-5=×+1
2x-x=1+5
x=6

C)2×+3=×+4

2x-x=4-3
x=1

D)5×+7=4×+10

5x-4x= 10-7
x= 3

A)2×+5-5×=-1

2x-5x=-1-5
-3x= -6 (-1)
3x=6


B)5+6×=5×+2

6x-5x=2-5
x= -3


C)×+2×-1-3=×

x+2x-x=1+3
2x=4
x=2 


D)-3×+10=2×+8+1
-3x-2x= 8+1-10
-6x= -1 (-1)
6x= 1
x= 0,1666666...

Answer 2

1
_

A) X - 4 = 3
=> X = 3 + 4
=> X = 7

B) X + 6 = 5
=> X = 5 - 6
=> X = - 1

C) X - 3 = - 7
=> X = - 7 + 4
=> X = - 3

D) X + 9 = - 1
=> X = - 1 - 9
=> X = - 10

E) X + 28 = 11
=> X = 11 - 28
=> X = - 17


2
_

A) 6X = 2X +16
=> 6X - 2X = 16
=> 4X = 16
=> X = 16/4
=> X = 4

B) 2X - 5 = X + 1
=> 2X - X = 1 + 5
=> X = 6

C) 2X + 3 = X + 4
=> 2X - X = 4 - 3
=> X = 1

D) 5x - 7 = 4X + 10
=> 5X - 4X = 10 - 7
=> X = 3


3
_

A) 2X + 5X - 5X = - 1
=> 2X = - 1
=> X = -1/2

B) 5 + 6X = 5X + 2
=> 6X - 5X = 2 - 5
=> X = -3

C) X + 2 + X - 1 - 3 = X
=> 2X +2 - 4 = X
=> 2X - 2 = X
=> 2X - X = 2
=> X = 2

D) - 3X + 10 = 2X + 8 + 1
=> - 3X + 10 = 2X + 9
=> - 3X - 2X = 9 - 10
=> - X =- 1...(-1)
=> X = 1