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3x - 9x - y = 5y - 2x - 9y
- 6x - y = - 2x - 4y
- 6x + 2x - y + 4y = 0
1) - 4x + 3y = 0
4x – (3y + 7) = 5y – 47 (2)
4x - 3y - 7 = 5y - 94
4x - 3y - 5y = - 94 + 7
2) 4x - 8y = - 87
Resolvemos por método de reducción.
1) - 4x + 3y = 0 (4)
2) 4x - 8y = - 87 (4)
- 16x + 12y = 0
16x - 32y = - 348
--------------------------
0x - 20y = - 348
- 20y = - 348
y = - 348/-20
y = 87/5
El valor de y lo reemplazo en ecuación 1
- 4x + 3y = 0
- 4x + 3 (87/5) = 0
- 4x + 261/5 = 0
- 4x = - 261/5
x = - 261/5/-4/1
x = - 261/-20
x = 261/20
Solución :
x = 261/20
y = 87/5