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x-y = -3
Despejamos x en ambas ecuaciones
x= 5/y
x= -3 +y
ahora las igualamos
5/y = -3 +y
Despejamos y
5 = y(-3 +y)
5 = -3y +y^2
igualamos la ecuacion a 0
-3y +y^2 -5 = 0
y^2 -3y -5 = 0
Resolvemos por ecuacion general
-(3-) +- raiz( -3^2 -4(1)(-5)) / 2(1)
x = 3 +- raiz(9 + 20) / 2
x = 3 +- raiz (29) /2
x = (3+- 5.38 )/2
x1= (3+5.38)/2
x1 = 8.38/2
x1= 4.19
x1 = 419/100
x2 = (3-4.38)/2
x2= -1.38/2
x2 = 0.69
x2= 69/100