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+ = 68x=90
8x-6y=10...x7====>56x- 42y=70
x= 68/90= 34/45 #
2 7 | 5 2 7 | 5 1 7/2 | 5/2
8 -6 | 10 ⇒ -4E1+E2 ⇒ 0 -34| -10 ⇒ 1/2E1 y -1/34E2 ⇒ 0 1 | 10/34
⇒-7/2E2+E1 ⇒ 1 0 | 25/17
0 1| 10/34
Siendo así x= 25/17
y= 10/34