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1) 2u - 5v = 23 (2)
2) 3u + 2v = 15 (5)
4u - 10v = 46
15u + 10v = 75
--------------------
20u + 0v = 121
19u = 121
u = 121/19
Reemplazo el valor de u en ecuación 2.
3u + 2v = 15
3 (121/19) + 2v = 15
363/19 + 2v = 15
2v = 15 - 363/19
2v = (15 * 19 - 363)/19
2v = (285 - 363)/19
2v = - 78/19
v = - 78/19/2/1
v = - 78/38
v = - 39/19
Solución :
u = 121/19
v = - 39/19