Leysa {l}{22,7x+13,6y+0z=408,24}{13,6x+13,6y+22,68z=36288}{9.07x+13,6y+22.68z=317.52}

$$\left. \begin{array} { l } { 22,7 x + 13,6 y + 0 z = 408,24 } \\ { 13,6 x + 13,6 y + 22,68 z = 36288 } \\ { 9.07 x + 13,6 y + 22.68 z = 317.52 } \end{array} \right.$$

Leystu fyrir x, y, z

$$x = \frac{1199016}{151} = 7940\frac{76}{151} \approx 7940.503311258$$

$$y = -\frac{19967661}{1510} = -13223\frac{931}{1510} \approx -13223.616556291$$

$$z = \frac{2159906}{453} = 4768\frac{2}{453} \approx 4768.004415011$$

Styttri leiðir við notkun innsetningar

Leystu 22.7x+13.6y+0z=408.24 fyrir x.

$$x=-\frac{136}{227}y+\frac{20412}{1135}$$

Settu -\frac{136}{227}y+\frac{20412}{1135} inn fyrir x í annarri og þriðju jöfnu.

$$13.6\left(-\frac{136}{227}y+\frac{20412}{1135}\right)+13.6y+22.68z=36288 9.07\left(-\frac{136}{227}y+\frac{20412}{1135}\right)+13.6y+22.68z=317.52$$

Leystu þessar jöfnur fyrir y og z í þessari röð.

$$y=\frac{7305228}{1105}-\frac{18387}{4420}z z=-\frac{46342}{128709}y+\frac{7727}{1135}$$

Settu \frac{7305228}{1105}-\frac{18387}{4420}z inn fyrir y í hinni jöfnunni z=-\frac{46342}{128709}y+\frac{7727}{1135}.

$$z=-\frac{46342}{128709}\left(\frac{7305228}{1105}-\frac{18387}{4420}z\right)+\frac{7727}{1135}$$

Leystu z=-\frac{46342}{128709}\left(\frac{7305228}{1105}-\frac{18387}{4420}z\right)+\frac{7727}{1135} fyrir z.

$$z=\frac{2159906}{453}$$

Settu \frac{2159906}{453} inn fyrir z í hinni jöfnunni y=\frac{7305228}{1105}-\frac{18387}{4420}z.

$$y=\frac{7305228}{1105}-\frac{18387}{4420}\times \frac{2159906}{453}$$

Reiknaðu y frá y=\frac{7305228}{1105}-\frac{18387}{4420}\times \frac{2159906}{453}.

$$y=-\frac{19967661}{1510}$$

Settu -\frac{19967661}{1510} inn fyrir y í hinni jöfnunni x=-\frac{136}{227}y+\frac{20412}{1135}.

$$x=-\frac{136}{227}\left(-\frac{19967661}{1510}\right)+\frac{20412}{1135}$$

Reiknaðu x frá x=-\frac{136}{227}\left(-\frac{19967661}{1510}\right)+\frac{20412}{1135}.

$$x=\frac{1199016}{151}$$

Leyst var úr kerfinu.

$$x=\frac{1199016}{151} y=-\frac{19967661}{1510} z=\frac{2159906}{453}$$