Whakaoti i te {l}{x-y=3}{2x+3y=19}

$$\left. \begin{array} { l } { x - y = 3 } \\ { 2 x + 3 y = 19 } \end{array} \right.$$

Whakaoti mō x, y

$$x = \frac{28}{5} = 5\frac{3}{5} = 5.6$$

$$y = \frac{13}{5} = 2\frac{3}{5} = 2.6$$

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.

$$x-y=3,2x+3y=19$$

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

$$x-y=3$$

Me tāpiri y ki ngā taha e rua o te whārite.

$$x=y+3$$

Whakakapia te y+3 mō te x ki tērā atu whārite, 2x+3y=19.

$$2\left(y+3\right)+3y=19$$

Whakareatia 2 ki te y+3.

$$2y+6+3y=19$$

Tāpiri 2y ki te 3y.

$$5y+6=19$$

Me tango 6 mai i ngā taha e rua o te whārite.

$$5y=13$$

Whakawehea ngā taha e rua ki te 5.

$$y=\frac{13}{5}$$

Whakaurua te \frac{13}{5} mō y ki x=y+3. I te mea kotahi anake te taurangi kei te whārite i puta, ka taea e koe te whakaoti mō x hāngai tonu.

$$x=\frac{13}{5}+3$$

Tāpiri 3 ki te \frac{13}{5}.

$$x=\frac{28}{5}$$

Kua oti te pūnaha te whakatau.

$$x=\frac{28}{5},y=\frac{13}{5}$$

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.

$$x-y=3,2x+3y=19$$

Tuhia ngā whārite ki te tikanga tātai poukapa.

$$\left(\begin{matrix}1&-1\\2&3\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}3\\19\end{matrix}\right)$$

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

$$inverse(\left(\begin{matrix}1&-1\\2&3\end{matrix}\right))\left(\begin{matrix}1&-1\\2&3\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}1&-1\\2&3\end{matrix}\right))\left(\begin{matrix}3\\19\end{matrix}\right)$$

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

$$\left(\begin{matrix}1&0\\0&1\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}1&-1\\2&3\end{matrix}\right))\left(\begin{matrix}3\\19\end{matrix}\right)$$

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

$$\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}1&-1\\2&3\end{matrix}\right))\left(\begin{matrix}3\\19\end{matrix}\right)$$

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

$$\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}\frac{3}{3-\left(-2\right)}&-\frac{-1}{3-\left(-2\right)}\\-\frac{2}{3-\left(-2\right)}&\frac{1}{3-\left(-2\right)}\end{matrix}\right)\left(\begin{matrix}3\\19\end{matrix}\right)$$

Mahia ngā tātaitanga.

$$\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}\frac{3}{5}&\frac{1}{5}\\-\frac{2}{5}&\frac{1}{5}\end{matrix}\right)\left(\begin{matrix}3\\19\end{matrix}\right)$$

Whakareatia ngā poukapa.

$$\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}\frac{3}{5}\times 3+\frac{1}{5}\times 19\\-\frac{2}{5}\times 3+\frac{1}{5}\times 19\end{matrix}\right)$$

Mahia ngā tātaitanga.

$$\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}\frac{28}{5}\\\frac{13}{5}\end{matrix}\right)$$

Tangohia ngā huānga poukapa x me y.

$$x=\frac{28}{5},y=\frac{13}{5}$$

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.

$$x-y=3,2x+3y=19$$

Kia ōrite ai a x me 2x, whakareatia ngā kīanga tau katoa kei ia taha o te whārite tuatahi ki te 2 me ngā kīanga tau katoa kei ia taha o te whārite tuarua ki te 1.

$$2x+2\left(-1\right)y=2\times 3,2x+3y=19$$

Whakarūnātia.

$$2x-2y=6,2x+3y=19$$

Me tango 2x+3y=19 mai i 2x-2y=6 mā te tango i ngā kīanga tau ōrite i ia taha o te tohu ōrite.

$$2x-2x-2y-3y=6-19$$

Tāpiri 2x ki te -2x. Ka whakakore atu ngā kupu 2x me -2x, ka toe he whārite me tētahi taurangi kotahi ka taea te whakaoti.

$$-2y-3y=6-19$$

Tāpiri -2y ki te -3y.

$$-5y=6-19$$

Tāpiri 6 ki te -19.

$$-5y=-13$$

Whakawehea ngā taha e rua ki te -5.

$$y=\frac{13}{5}$$

Whakaurua te \frac{13}{5} mō y ki 2x+3y=19. I te mea kotahi anake te taurangi kei te whārite i puta, ka taea e koe te whakaoti mō x hāngai tonu.

$$2x+3\times \frac{13}{5}=19$$

Whakareatia 3 ki te \frac{13}{5}.

$$2x+\frac{39}{5}=19$$

Me tango \frac{39}{5} mai i ngā taha e rua o te whārite.

$$2x=\frac{56}{5}$$

Whakawehea ngā taha e rua ki te 2.

$$x=\frac{28}{5}$$

Kua oti te pūnaha te whakatau.

$$x=\frac{28}{5},y=\frac{13}{5}$$