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xy-2x+4y=25 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
x*y - 2*x + 4*y = 25
$$4 y + \left(x y - 2 x\right) = 25$$
Solución detallada
Tenemos una ecuación lineal:
x*y-2*x+4*y = 25

Sumamos los términos semejantes en el miembro izquierdo de la ecuación:
-2*x + 4*y + x*y = 25

Move the summands with the other variables
del miembro izquierdo al derecho, obtenemos:
$$x y - 2 x = 25 - 4 y$$
Dividamos ambos miembros de la ecuación en (-2*x + x*y)/x
x = 25 - 4*y / ((-2*x + x*y)/x)

Obtenemos la respuesta: x = (25 - 4*y)/(-2 + y)
Resolución de la ecuación paramétrica
Se da la ecuación con parámetro:
$$x y - 2 x + 4 y = 25$$
Коэффициент при x равен
$$y - 2$$
entonces son posibles los casos para y :
$$y < 2$$
$$y = 2$$
Consideremos todos los casos con detalles:
Con
$$y < 2$$
la ecuación será
$$- x - 21 = 0$$
su solución
$$x = -21$$
Con
$$y = 2$$
la ecuación será
$$-17 = 0$$
su solución
no hay soluciones
Gráfica
Suma y producto de raíces [src]
suma
                                                                   2                                        
  /   (25 - 4*re(y))*im(y)     4*(-2 + re(y))*im(y) \          4*im (y)          (-2 + re(y))*(25 - 4*re(y))
I*|- ---------------------- - ----------------------| - ---------------------- + ---------------------------
  |              2     2                  2     2   |               2     2                     2     2     
  \  (-2 + re(y))  + im (y)   (-2 + re(y))  + im (y)/   (-2 + re(y))  + im (y)      (-2 + re(y))  + im (y)  
$$\frac{\left(25 - 4 \operatorname{re}{\left(y\right)}\right) \left(\operatorname{re}{\left(y\right)} - 2\right)}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}} + i \left(- \frac{\left(25 - 4 \operatorname{re}{\left(y\right)}\right) \operatorname{im}{\left(y\right)}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}} - \frac{4 \left(\operatorname{re}{\left(y\right)} - 2\right) \operatorname{im}{\left(y\right)}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}}\right) - \frac{4 \left(\operatorname{im}{\left(y\right)}\right)^{2}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}}$$
=
                                                                   2                                        
  /   (25 - 4*re(y))*im(y)     4*(-2 + re(y))*im(y) \          4*im (y)          (-2 + re(y))*(25 - 4*re(y))
I*|- ---------------------- - ----------------------| - ---------------------- + ---------------------------
  |              2     2                  2     2   |               2     2                     2     2     
  \  (-2 + re(y))  + im (y)   (-2 + re(y))  + im (y)/   (-2 + re(y))  + im (y)      (-2 + re(y))  + im (y)  
$$\frac{\left(25 - 4 \operatorname{re}{\left(y\right)}\right) \left(\operatorname{re}{\left(y\right)} - 2\right)}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}} + i \left(- \frac{\left(25 - 4 \operatorname{re}{\left(y\right)}\right) \operatorname{im}{\left(y\right)}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}} - \frac{4 \left(\operatorname{re}{\left(y\right)} - 2\right) \operatorname{im}{\left(y\right)}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}}\right) - \frac{4 \left(\operatorname{im}{\left(y\right)}\right)^{2}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}}$$
producto
                                                                   2                                        
  /   (25 - 4*re(y))*im(y)     4*(-2 + re(y))*im(y) \          4*im (y)          (-2 + re(y))*(25 - 4*re(y))
I*|- ---------------------- - ----------------------| - ---------------------- + ---------------------------
  |              2     2                  2     2   |               2     2                     2     2     
  \  (-2 + re(y))  + im (y)   (-2 + re(y))  + im (y)/   (-2 + re(y))  + im (y)      (-2 + re(y))  + im (y)  
$$\frac{\left(25 - 4 \operatorname{re}{\left(y\right)}\right) \left(\operatorname{re}{\left(y\right)} - 2\right)}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}} + i \left(- \frac{\left(25 - 4 \operatorname{re}{\left(y\right)}\right) \operatorname{im}{\left(y\right)}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}} - \frac{4 \left(\operatorname{re}{\left(y\right)} - 2\right) \operatorname{im}{\left(y\right)}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}}\right) - \frac{4 \left(\operatorname{im}{\left(y\right)}\right)^{2}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}}$$
=
 /    2                                               \ 
-\4*im (y) + (-25 + 4*re(y))*(-2 + re(y)) + 17*I*im(y)/ 
--------------------------------------------------------
                             2     2                    
                 (-2 + re(y))  + im (y)                 
$$- \frac{\left(\operatorname{re}{\left(y\right)} - 2\right) \left(4 \operatorname{re}{\left(y\right)} - 25\right) + 4 \left(\operatorname{im}{\left(y\right)}\right)^{2} + 17 i \operatorname{im}{\left(y\right)}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}}$$
-(4*im(y)^2 + (-25 + 4*re(y))*(-2 + re(y)) + 17*i*im(y))/((-2 + re(y))^2 + im(y)^2)
Respuesta rápida [src]
                                                                        2                                        
       /   (25 - 4*re(y))*im(y)     4*(-2 + re(y))*im(y) \          4*im (y)          (-2 + re(y))*(25 - 4*re(y))
x1 = I*|- ---------------------- - ----------------------| - ---------------------- + ---------------------------
       |              2     2                  2     2   |               2     2                     2     2     
       \  (-2 + re(y))  + im (y)   (-2 + re(y))  + im (y)/   (-2 + re(y))  + im (y)      (-2 + re(y))  + im (y)  
$$x_{1} = \frac{\left(25 - 4 \operatorname{re}{\left(y\right)}\right) \left(\operatorname{re}{\left(y\right)} - 2\right)}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}} + i \left(- \frac{\left(25 - 4 \operatorname{re}{\left(y\right)}\right) \operatorname{im}{\left(y\right)}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}} - \frac{4 \left(\operatorname{re}{\left(y\right)} - 2\right) \operatorname{im}{\left(y\right)}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}}\right) - \frac{4 \left(\operatorname{im}{\left(y\right)}\right)^{2}}{\left(\operatorname{re}{\left(y\right)} - 2\right)^{2} + \left(\operatorname{im}{\left(y\right)}\right)^{2}}$$
x1 = (25 - 4*re(y))*(re(y) - 2)/((re(y) - 2)^2 + im(y)^2) + i*(-(25 - 4*re(y))*im(y)/((re(y) - 2)^2 + im(y)^2) - 4*(re(y) - 2)*im(y)/((re(y) - 2)^2 + im(y)^2)) - 4*im(y)^2/((re(y) - 2)^2 + im(y)^2)