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1)100x + 33y = 21 (9)
2) 70x - 9y = 4 (33)
900x + 297y = 189
2310x - 297y = 132
-------------------------
3210x + 0y = 321
3210x = 321
x = 321/3210
x = 1/10
Reemplazo x = 1/10 en ecuación 2.
70x - 9y = 4
70 (1/10) - 9y = 4
70/10 - 9y = 4
7 - 9y = 4
- 9y = 4 - 7
- 9y = - 3
y = -3/-9
y = 1/3
Solución :
x = 1/10
y = 1/3