Question

ECUACIONES DE TAREA: DOY 12 PUNTOS!
A) 3X+9=21
B) 5X+4=4X -3
C) 5= -23-2X
D) 3+X=10 -X
E) 3X -10+5X=54
F) 5X -25=75
G) 82 -2X=100
H) 24=X -18
I) 5=3X -31
J) 7X+28=70

Answer 1

A)
3X+9=21
3x = 12
x = 4

B)
5X+4=4X -3
x = -1

C)
5= -23-2X
28 = -2x
-14 x

D)
3+X=10 -X
2x = 7
x = 7/2

E)
3X -10+5X=54
8x = 64
x = 8

F)
5X -25=75
5x = 100
x = 20

G)
82 -2X=100
-2x = 18
x = -9

H)
24=X -18
42 = x

I)
5=3X -31
36 = 3x
12 = x

J)
7X+28=70
7x = 42
x = 6

Answer 2

3x + 9 = 21

3x = 21 - 9

3x = 12

x = 12/3

x = 4
---------------------------

5x + 4 = 4x - 3

5x - 4x = - 3 - 4

x = - 7
--------------------------
5 = - 23 - 2x

2x = - 23 - 5

2x = - 28

x = -28/2

x = - 14
-----------------------------

3 + x = 10 - x

x + x = 10 - 3

2x = 7

x = 7/2
-----------------------------

3x - 10 + 5x = 54

3x - 5x = 54 + 10

- 2x = 64

x = 64/-2

x = - 32
----------------------------

5x - 25 = 75

5x = 75 + 25

5x = 100

x = 100/5

x = 20
-------------------------------

82 - 2x = 100

- 2x = 100 - 82

- 2x = 18

x = 18/-2

x = - 9
--------------------------------

24 = x - 18

- x = - 18 - 24

- x = - 42

x = 42
------------------------------

5 = 3x - 31

- 3x = - 31 - 5

- 3x = - 36

x = -36/-3

x = 12
-----------------------------

7x + 28 = 70

7x = 70 - 28

7x = 42

x = 42/7

x = 6