Question

Alguien que me ayude con este trabajo por favor

Answer 1

2)

a)

x - y = 8

x - y = 83x + 5y = 16

x1 = 8 + y/x

3 (8 + y) + 5y = 16

24 + 3y + 5y = 16

3y + 5y = 16 - 24

8y = -8

y = -8/8

y = -1

x - y = 8

x - (-1) = 8

x + 1 = 8

x = 8 - 1

x = 7

3x + 5y = 16

3x + 5(-1) = 16

3x - 5 = 16

3x = 16 + 5

3x = 21

x = 21/3

x = 7

x = 7 ; y = -1

b)

4x + y = 8

2x + 3y = -6

x1 = 8 - y/4

2 (8 - y/4) + 3y = -6

8 - y = 2 (-6 - 3y)

8 - y = -12 - 6y

-y + 6y = -12 - 8

5y = -20

y = -20/5

y = -4

4x + y = 8

4x + (-4) = 8

4x - 4 = 8

4x = 8 + 4

4x = 12

x = 12/4

x = 3

2x + 3y = -6

2x + 3(-4) = -6

2x - 12 = -6

2x = -6 + 12

2x = 6

x = 6/2

x = 3

x = 3 ; y = -4

c)

5x - 2y = 1

3x - y = 1

x1 = 1 + 2y/5

3 (1 + 2y/5) - y = 1

3 (1 + 2y) = 5 (1 + y)

3 + 6y = 5 + 5y

6y - 5y = 5 - 3

y = 2

5x - 2y = 1

5x - 2(2) = 1

5x - 4 = 1

5x = 1 + 4

5x = 5

x = 5/5

x = 1

3x - y = 1

3x - 2 = 1

3x = 1 + 2

3x = 3

x = 3/3

x = 1

x = 1 ; y = 2

d)

5x + 7y = -8

-x + 2y = 5

x1 = -8 - 7y/5

-(-8 - 7y/5) + 2y = 5

8 + 7y = 5 (5 - 2y)

8 + 7y = 25 - 10y

7y + 10y = 25 - 8

17y = 17

y = 17/17

y = 1

5x + 7y = -8

5x + 7(1) = -8

5x + 7 = -8

5x = -8 - 7

5x = -15

x = -15/5

x = -3

-x + 2y = 5

-x + 2(1) = 5

-x + 2 = 5

-x = 5 - 2

(-) -x = 3

x = -3

x = -3 ; y = 1

e)

2x + 3y = 2

3x + 2y = 8

x1 = 2 - 3y/2

3 (2 - 3y/2) + 2y = 8

3 (2 - 3y) = 2 (-2y + 8)

6 - 9y = - 4y + 16

-9y + 4y = 16 - 6

-5y = 10

-y = 10/5

(-) -y = -2

y = -2

2x + 3y = 2

2x + 3(-2) = 2

2x - 6 = 2

2x = 2 + 6

2x = 8

x = 8/2

x = 4

3x + 2y = 8

3x + 2(-2) = 8

3x - 4 = 8

3x = 8 + 4

3x = 12

x = 12/3

x = 4

x = 4 ; y = -2

f)

4x - 6y = -3

8x + 3y = 4

x1 = -3 + 6y/4

8 (-3 + 6y/4) + 3y = 4

8 (-3 + 6y) = 4 (-3y + 4)

-24 + 48y = -12y + 16

48y + 12y = 16 + 24

60y = 40

y = 40/60

y = 2/3 ó 0.66

4x - 6y = -3

4x - 6(2/3) = - 3

4x - 4 = -3

4x = -3 + 4

4x = 1

x = 1/4

8x + 3y = 4

8x + 3(2/3) = 4

8x + 2 = 4

8x = 4 - 2

8x = 2

x = 2/8

x = 1/4

x = 1/4 ; y = 2/3

3)

a)

x - 2y = 7

x + 5y = -7

x1 = 7 + 2y /1

x2 = -7 - 5y/1

7 + 2y = -7 - 5y

2y + 5y = -7 - 7

7y = - 14

y = - 14/7

y = -2

x - 2y = 7

x - 2(-2) = 7

x + 4 = 7

x = 7 - 4

x = 3

x + 5y = -7

x + 5 (-2) = -7

x - 10 = - 7

x = -7 + 10

x = 3

x = 3 ; y = -2

b)

6x - y = 13

3x - y = 4

x1 = 13 + y/6

x2 = 4 + y/3

3 (13 + y) = 6 (4 + y)

39 + 3y = 24 + 6y

3y - 6y = 24 - 39

(-) -3y = -15

3y = 15

y = 15/3

y = 5

6x - y = 13

6x - 5 = 13

6x = 13 + 5

6x = 18

x = 18/6

x = 3

3x - y = 4

3x - 5 = 4

3x = 4 + 5

3x = 9

x = 9/3

x = 3

x = 3 ; y = 5

c)

3x - 5y = -10

x + 2y = 37

x1 = -10 + 5y/3

x2 = 37 - 2y/1

-10 + 5y = 3(37 - 2y)

-10 + 5y = 111 - 6y

5y + 6y = 111 + 10

11y = 121

y = 121/11

y = 11

3x - 5y = -10

3x - 5(11) = -10

3x - 55 = -10

3x = -10 + 55

3x = 45

x = 45/3

x = 15

x + 2y = 37

x + 2(11) = 37

x + 22 = 37

x = 37 - 22

x = 15

x = 15 ; y = 11

Espero haberte ayudado. Suerte en los estudios ≧◠◡◠≦.

Answer 2

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