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-6x + 12y =1
De despejan las x en ambas
2 - 3y 1 - 12y
x = ---------- x = ------------
2 -6
se igualan
2 - 3y 1 - 12y
--------- = -------------
2 - 6
2(1 - 12y) = - 6 (2 - 3y)
2 - 24y = -12 + 18y
2 + 12 = 18y + 24y
14 = 42y
14 1 1
y = ------- = ------ ⇒ y = -----
42 3 3
sustituimos el valor de y=1/3 en cualquiera de las dos.
2x + 3y = 2
3
2x + ------ = 2
3
2x + 1 = 2
2x = 2-1 1
2x = 1 ⇒ x = --------
2
Comprobamos x = 1/2 e y = 1/3
2 3
2x + 3y = 2 ----- + ----- = 1 + 1 = 2
2 3
-6 12
-6x+ 12y =1 ----- + ----- = - 3 + 4 = 1
2 3
-------------------------------------------------------------------------------
5x + 2y = 11
2x - 3y = 12
11 - 2y 12 + 3y
x = ------------- x = --------------
5 2
11 - 2y 12 + 3y
------------- = --------------
5 2
2 (11 - 2y) = 5 (12 + 3y)
22 - 4y = 60 + 15y
22 - 60 = 15y + 4y
- 38 = 19y
- 38
y = ------- = - 2 ⇒ y = - 2
19
sustituimos el valor y = - 2 en una de las dos.
5x + 2y =11
5x - 4 = 11
5x = 11 + 4 15
5x = 15 x = ------ ⇒ x = 3
5
Comprobamos para x = 3 e y = - 2
5x + 2y = 11
5 (3) + 2 (-2) =11
15 - 4 = 11
2x-3y=12
2(3) - 3(-2) = 12
6 + 6 = 12
---------------------------------------------------------------------------------------------
5x - 2y = 2
x + 2y = 2
2 + 2y
x = ------------ x = 2 - 2y
5
2 + 2y
------------ = 2 - 2y
5
2 + 2y = 5 (2 - 2y)
2 + 2y = 10 - 10y
2y + 10y = 10 - 2 8 2 2
12y = 8 y = ------- = ------- ⇒ y = -----
12 3 3
se sustituye y = 2/3 en cualquiera de las dos.
5x - 2y = 2
4
5x - ----- = 2
3
15x - 4 = 6
15x = 6 + 4 10 2 2
15x = 10 x = ----- = ------ ⇒ x = -----
15 3 3
Comprobamos para x = 2/3 e y = 2/3
5x - 2y = 2
10 4 6
---- - ------- = ----- = 2
3 3 3
x + 2y = 2
2 4 6
---- + ----- = ---- = 2
3 3 3