Actividad 7
A) 3+2x=x-10
B) 6-3x=5x+70
C) 4+3x-3=2x+31-5x
D) 5 ( 3x+5)=100
E) 2 ( 4+2x)=40
Respuestas a la pregunta
Respuesta:
A) 3+2x=x-10
2x-x = -10 - 3
x = -13
B) 6-3x=5x+70
-5x-3x = 70 - 6
-8x = 64
x = 64/-8
x= -8
C) 4+3x-3=2x+31-5x
1 + 3x = -3x +31
3x + 3x = 31 -1
6x = 30
x = 30/6
x= 5
D) 5 ( 3x+5)=100
3x +5 = 20
3x = 20-5
3x= 15
x = 15/3
x= 5
E) 2 ( 4+2x)=40
4+2x = 20
2x = 20 - 4
2x = 16
x = 16/2
x= 8
Aquí te dejo mi respuesta:
A) 3 + 2x = x - 10
3 + 2x - 3 = x - 10 - 3
2x = x - 13
2x - x = x - 13 - x
x = -13
B) 6 - 3x = 5x + 70
6 - 3x - 6 = 5x + 70 - 6
-3x = 5x + 64
-3x - 5x = 5x + 64 - 5x
-8x = 64
x = -8
C) 4 + 3x - 3 = 2x + 31 - 5x
3x + 4 - 3 = 2x + 31 - 5x
3x + 1 = 2x + 31 - 5x
3x + 1 = 2x - 5x + 31
3x + 1 = -3x + 31
3x + 1 - 1 = -3x + 31 - 1
3x = -3x + 30
3x + 3x = -3x + 30 + 3x
6x = 30
x = 5
D) 5 (3x + 5) = 100
5(3x + 5)/5 = 100/5
3x + 5 = 20
3x + 5 - 5 = 20 - 5
3x = 15
x = 5
E) 2 (4 + 2x) = 40
2(4 + 2x)/2 = 40/2
4 + 2x = 20
4 + 2x - 4 = 20 - 4
2x = 16
x = 8
Espero haberte ayudado :D