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u + 3v =10
u + 3v =10
⇒ u= 10-3v
3u +2v =9
3(10-3v) +2v =9
30-9v +2v= 9
-7v= 9-30
7v= 21
v= 21/7
v= 3
reemplazando v en la segunda ec:
u + 3v =10
u + 3*3 = 10
u= 10-9
u=1
solucion:
v= 3
u= 1