Whakaoti i te {l}{3x+2y=0}{x+y=1}

$$\left. \begin{array} { l } { 3 x + 2 y = 0 } \\ { x + y = 1 } \end{array} \right.$$

Whakaoti mō x, y

$$x=-2$$

$$y=3$$

Ngā Upane e Whakamahi ana i te Whakakapinga

Hei whakaoti i ētahi whārite takirua mā te whakakapinga, me whakaoti tētahi whārite i te tuatahi mō tētahi o ngā taurangi. Ka whakakapi i te otinga mō taua taurangi ki tērā o ngā whārite.

$$3x+2y=0,x+y=1$$

Kōwhiria tētahi o ngā whārite ka whakaotia mō te x mā te wehe i te x i te taha mauī o te tohu ōrite.

$$3x+2y=0$$

Me tango 2y mai i ngā taha e rua o te whārite.

$$3x=-2y$$

Whakawehea ngā taha e rua ki te 3.

$$x=\frac{1}{3}\left(-2\right)y$$

Whakareatia \frac{1}{3} ki te -2y.

$$x=-\frac{2}{3}y$$

Whakakapia te -\frac{2y}{3} mō te x ki tērā atu whārite, x+y=1.

$$-\frac{2}{3}y+y=1$$

Tāpiri -\frac{2y}{3} ki te y.

$$\frac{1}{3}y=1$$

Me whakarea ngā taha e rua ki te 3.

$$y=3$$

Whakaurua te 3 mō y ki x=-\frac{2}{3}y. I te mea kotahi anake te taurangi kei te whārite i puta, ka taea e koe te whakaoti mō x hāngai tonu.

$$x=-\frac{2}{3}\times 3$$

Whakareatia -\frac{2}{3} ki te 3.

$$x=-2$$

Kua oti te pūnaha te whakatau.

$$x=-2,y=3$$

Ngā Upane e Whakamahi ana i Ngā Poukapa

Tuhia ngā whārite ki te tānga ngahuru ka whakamahi i ngā poukapa hei whakaoti i te pūnaha o ngā whārite.

$$3x+2y=0,x+y=1$$

Tuhia ngā whārite ki te tikanga tātai poukapa.

$$\left(\begin{matrix}3&2\\1&1\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}0\\1\end{matrix}\right)$$

Whakarea mauī i te whārite ki te poukapa kōaro o \left(\begin{matrix}3&2\\1&1\end{matrix}\right).

$$inverse(\left(\begin{matrix}3&2\\1&1\end{matrix}\right))\left(\begin{matrix}3&2\\1&1\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}3&2\\1&1\end{matrix}\right))\left(\begin{matrix}0\\1\end{matrix}\right)$$

Ko te hua o tētahi poukapa me te kōaro ko te poukapa tuakiri.

$$\left(\begin{matrix}1&0\\0&1\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}3&2\\1&1\end{matrix}\right))\left(\begin{matrix}0\\1\end{matrix}\right)$$

Whakareatia ngā poukapa kei te taha mauī o te tohu ōrite.

$$\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}3&2\\1&1\end{matrix}\right))\left(\begin{matrix}0\\1\end{matrix}\right)$$

Mō te poukapa 2\times 2 \left(\begin{matrix}a&b\\c&d\end{matrix}\right), ko te poukapa kōaro ko \left(\begin{matrix}\frac{d}{ad-bc}&\frac{-b}{ad-bc}\\\frac{-c}{ad-bc}&\frac{a}{ad-bc}\end{matrix}\right), kia tuhia anō ai te whārite poukapa hei rapanga whakarea poukapa.

$$\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}\frac{1}{3-2}&-\frac{2}{3-2}\\-\frac{1}{3-2}&\frac{3}{3-2}\end{matrix}\right)\left(\begin{matrix}0\\1\end{matrix}\right)$$

Mahia ngā tātaitanga.

$$\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}1&-2\\-1&3\end{matrix}\right)\left(\begin{matrix}0\\1\end{matrix}\right)$$

Whakareatia ngā poukapa.

$$\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}-2\\3\end{matrix}\right)$$

Tangohia ngā huānga poukapa x me y.

$$x=-2,y=3$$

Ngā Upane e Whakamahi i te Tangohanga

Hei whakaoti mā te tangohanga, ko ngā tau whakarea o tētahi o ngā taurangi me mātua ōrite i ngā whārite e rua kia whakakorehia ai te taurangi ina tangohia tētahi whārite mai i tētahi atu.

$$3x+2y=0,x+y=1$$

Kia ōrite ai a 3x me x, whakareatia ngā kīanga tau katoa kei ia taha o te whārite tuatahi ki te 1 me ngā kīanga tau katoa kei ia taha o te whārite tuarua ki te 3.

$$3x+2y=0,3x+3y=3$$

Me tango 3x+3y=3 mai i 3x+2y=0 mā te tango i ngā kīanga tau ōrite i ia taha o te tohu ōrite.

$$3x-3x+2y-3y=-3$$

Tāpiri 3x ki te -3x. Ka whakakore atu ngā kupu 3x me -3x, ka toe he whārite me tētahi taurangi kotahi ka taea te whakaoti.

$$2y-3y=-3$$

Tāpiri 2y ki te -3y.

$$-y=-3$$

Whakawehea ngā taha e rua ki te -1.

$$y=3$$

Whakaurua te 3 mō y ki x+y=1. I te mea kotahi anake te taurangi kei te whārite i puta, ka taea e koe te whakaoti mō x hāngai tonu.

$$x+3=1$$

Me tango 3 mai i ngā taha e rua o te whārite.

$$x=-2$$

Kua oti te pūnaha te whakatau.

$$x=-2,y=3$$