Question

método de igualacion
a.
5x + 3y = 21
7x + 8y = 37

B. 5x - 10y = 25
8x + 2y = 4

método de determinantes
a. -4x + y = 20
6x - 9y = 0

B. -3x - 4y = 31
5x - 9y = 11

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Answer 1

idytsfs

Explicación paso a paso:

facil

Answer 2

Respuesta:

método de igualacion

a.

5x + 3y = 21

5x=21-3y

x=21-3y

----------

5

x=3(7-y)

----------

5

7x + 8y = 37

7x=37-8y

x=37-8y

---------

7

B. 5x - 10y = 25

5(x−2y)=25

x-2y=25/5

x-2y=5

x=5+2y

8x + 2y = 4

2(4x+y)=4

4x+y=4/2

4x+y=2

4x=2-y

x=2-y

-------

4

método de determinantes

a. -4x + y = 20

y=20+4x

y-20=4x

y-20 =x

--------

4

x=y-20

---------

4

6x - 9y = 0

3(2x−3y)=0

2x-3y=0

2x=3y

x=3y/2

B. -3x - 4y = 31

−3x=31+4y

x= 31+4y

- ______

3

5x - 9y = 11

5x=11+9y

x= 11+9y

- _____

5