Réitigh {l}{5x-2y+2=4}{x-y-4z=1}{2x-4y+2z=8}

$$\left. \begin{array} { l } { 5 x - 2 y + 2 = 4 } \\ { x - y - 4 z = 1 } \\ { 2 x - 4 y + 2 z = 8 } \end{array} \right.$$

Réitigh do x,y,z.

$$x=-\frac{16}{35}\approx -0.457142857$$

$$y = -\frac{15}{7} = -2\frac{1}{7} \approx -2.142857143$$

$$z=\frac{6}{35}\approx 0.171428571$$

Céimeanna gearra ag baint úsáid as ionadú

Athraigh ord na gcothromóidí.

$$x-y-4z=1 5x-2y+2=4 2x-4y+2z=8$$

Réitigh x-y-4z=1 do x.

$$x=y+4z+1$$

Cuir y+4z+1 in ionad x sa dara agus sa tríú cothromóid.

$$5\left(y+4z+1\right)-2y+2=4 2\left(y+4z+1\right)-4y+2z=8$$

Réitigh na cothromóidí seo do y agus z faoi seach.

$$y=-\frac{20}{3}z-1 z=\frac{3}{5}+\frac{1}{5}y$$

Cuir -\frac{20}{3}z-1 in ionad y sa chothromóid z=\frac{3}{5}+\frac{1}{5}y.

$$z=\frac{3}{5}+\frac{1}{5}\left(-\frac{20}{3}z-1\right)$$

Réitigh z=\frac{3}{5}+\frac{1}{5}\left(-\frac{20}{3}z-1\right) do z.

$$z=\frac{6}{35}$$

Cuir \frac{6}{35} in ionad z sa chothromóid y=-\frac{20}{3}z-1.

$$y=-\frac{20}{3}\times \frac{6}{35}-1$$

Ríomh y ó y=-\frac{20}{3}\times \frac{6}{35}-1.

$$y=-\frac{15}{7}$$

Cuir -\frac{15}{7} in ionad y agus \frac{6}{35} in ionad z sa chothromóid x=y+4z+1.

$$x=-\frac{15}{7}+4\times \frac{6}{35}+1$$

Ríomh x ó x=-\frac{15}{7}+4\times \frac{6}{35}+1.

$$x=-\frac{16}{35}$$

Tá an córas réitithe anois.

$$x=-\frac{16}{35} y=-\frac{15}{7} z=\frac{6}{35}$$