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1) - 2x + 5y = 7 (1)
2) x + 2y = 3 (2)
- 2x + 5y = 7
2x + 4y = 6
-------------------
0x + 9y = 13
9y = 13
y = 13/9
Sustituyo y en 2
x + 2y = 3
x + 2 (13/9) = 3
x + 26/9 = 3
x = 3 - 26/9
x = (3 * 9 - 26)/9
x = (27 - 29)/9
x = 1/9
Solución.
x = 1/9
y = 13/9
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1) - x + 2y = 7
2) 3x - 2y = 3
--------------------
2x + 0y = 10
2x = 10
x = 10/2
x = 5
Sustituyo x en 1
- x + 2y = 7
- 5 + 2y = 7
2y = 7 5
2y = 12
y = 12/2
y = 6
Solución.
x = 5
y = 6
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1) - x - 2y = 7 (3)
2) 3x - 2y = 3 (1)
- 3x - 6y = 21
3x - 2y = 3
--------------------------
0x - 8y = 24
- 8y = 24
y = 24/-8
y = - 3
Sustituyo y en 1
- x - 2y = 7
- (- 3) - 2y = 7
3 - 2y = 7
- 2y = 7 - 3
- 2y = 4
y = 4/-2
y = - 2
Solución.
x = - 3
y = - 2
---------------------------------------
1) 4x - 2y = 7 (2)
2) 3x - 2y = 3 (-2)
8x - 4y = 14
- 6x + 4y = - 6
---------------------
2x + 0y = 8
2x = 8
x = 8/2
x = 4
Sustituyo x en 2
3x - 2y = 3
3 (4) - 2y = 3
12 - 2y = 3
- 2y = 3 - 12
- 2y = - 9
y = -9/-2
y = 9/2
Solución.
x = 4
y = 9/2