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1) x - y = 14
2) 15x - 10y = 180
Despejo x en 1
x - y = 14
x = 14 + y
Sustituyo x en 2
15x - 10y = 180
15 (14 + y) - 10y = 180
210 + 15y - 10y = 180
15y - 10y = 180 - 210
5y = - 30
y = - 30/5
y = - 6
El valor de y sustituyo en el despeje de x
x = 14 + y
x = 14 - 6
x = 8
Solución :
x = 8
y = - 6