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1) 5x + 6y = 17
2) 15x - 4y = - 4
Despejo x en ecuación 1
5x + 6y = 17
5x = 17 - 6y
x = (17 - 6y)/5
Sustituyo el despeje de x en ecuación 2
15x - 4y = - 4
15 (17 - 6y)/5 - 4y = - 4
3 (17 - 6y) - 4y = - 4
51 - 18y - 4y = - 4
- 18y - 4y = - 4 - 51
- 22y = - 55
y = - 55/-22
y = 5/2
El valor de y lo sustituyo en el despeje de x
x = (17 - 6y)/5
x = (17 - 6 (5/2)/5
x = (17 - 3 * 5)/5
x = (17 - 15)/5
x = 2/5
Respuesta.
x = 2/5
y = 5/2