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1) 13x + 13y = 17 (7)
2) - 7x + 10y = 27 (13)
91x + 91y = 119
-91x + 130y = 351
-----------------------
0x + 221y = 470
221y = 470
y = 470/221
Reemplazo y = 470/221 en ecuación 2.
- 7x + 10y = 27
- 7x + 10 (470/221) = 27
- 7x + 4700/221 = 27
- 7x = 27 - 4700/221
5967 - 4700 1267
- 7x = ----------------- = -------------
221 221
- 7x = 1267/221
x = 1267/221/-7/1
x = 1267/-1547
x = - 181/221
Solución :
x = - 181/221
y = 470/221