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1) 3x + 2y = 7 (1)
2) - x + 5y = 20 (3)
3x + 2y = 7
-3x + 15y = 60
-----------------------
0x + 17y = 67
17y = 67
y = 67/17
Reemplazo el valor de y en ecuación 2.
- x + 5y = 20
- x + 5 (67/17) = 20
- x + 335/17 = 20
- x = 20 - 335/17
- x = (20 * 17 - 335)/17
- x = (340 - 335)/17
- x = 5/17
x = - 5/17
Solución :
x = - 5/17
y = 67/17