Question

Resolva pelo metodo da adiçâo as equaçôes com duas incógnitas :

2x+3y=8
5x-3y=-1

x+2y=7
4x-y=10

5x+3y=5
x+4y=18

x+2y=-3
5x-2y= -1

4x-y=2
3x+2y=7

x+3y=9
3x+2y=6

Answer 1

Resposta:

Explicação passo-a-passo:

2x+3y=8

5x-3y=-1

-------------

7x=7

x=7/7

x=1

--------------------------------------------------

x+2y=7

4x-y=10

---------------

5x+y=17

y=17-5x

-------------

5x+17-5x=17

=0

--------------------------------------------------------

5x+3y=5

x+4y=18

--------------

6x+7y=23

7y=23-6x

y=23-6x/7

--------------

6x+23-6x/7=23

42x+23-6x=23

36x=0

x= 36

------------------------------------------------------------

x+2y=-3

5x-2y= -1

------------

6x=-4

x=-4/6

-------------------------------------------------------------

4x-y=2

3x+2y=7

-----------

7x+y=9

y=9-7x

7x+9-7x=9

=0

-----------------------------------------------------------------

x+3y=9

3x+2y=6

---------------

4x+5y=15

5y=15

y=15/5

y=3

--------

4x+5.3=15

4x=0

x=4