Question

Resolver y verificar las siguientes ecuaciones

A. 2× + 13 = - 15

B. 7× + 8 = 64

C. 20 =3× - 5 . (-14)

D. × + 3× + 5 = -3 . 5

E . 3 . 4 - 5 . 6 = 2× + 7×

F. -8× - 6 + × + 8 = - 31 + 3 × -7

G. -2× + 6× - 8 = - 36 : 4 + 8× - 7

Answer 1

Respuesta:

A. 2× + 13 = - 15

2x= -15-13

2x= -28

x=-28/2

2x= -14

comprobación

2( -14) +13= -15

-28+13= -15

-15=-15

B. 7× + 8 = 64

7x= 64-8

7x= 56

x=56/7

x= 8

comprobación

7(8)+8=64

56+8= 64

64=64

C. 20 =3× - 5 . (-14)

20= 3x- 70

-3x= -70+20

-3x= -50

x= -50/-3

x=+ 16.6

comprobación

20= 3(-16.6)-5(-14)

20= -50+70

20= 20

D.

× + 3× + 5 = -3 . 5

9x= -3.5

x= -3.5/9

x= 0.38

comprobación

(-0.4) + 3(-0.4) +5= -3.5

+3.47=-3.5

-3.5{-3.5

E . 3 . 4 - 5 . 6 = 2× + 7×

+2.2= 9x

+2.2/9=x

-0.24

F. -8× - 6 + × + 8 = - 31 + 3 × -7

-8x+x-3x= -31-7+6-8

6x= -40

x= -40/6

x= -6.6

comprobación

-8(-6.6)-6+(-6.6)+8=-31+3(-6.6)-7

+53.3-6-6.6+8= -31-20-7

57.6=58

58=58

G. -2× + 6× - 8 = - 36 : 4 + 8× - 7

-2x+6x-8x= - 9-7-8

-4x= +8

x=-8/-4

x= +2

comprobación

-2(+2) +6(+2)-8= -36:4+8(+2)-7

-4+12-8=-9+16-7

0=0