Whakaoti i te {l}{3x+2y=4}{6x-2y=-1}

$$\left\{ \begin{array} { l } { 3 x + 2 y = 4 } \\ { 6 x - 2 y = - 1 } \end{array} \right.$$

Whakaoti mō x, y

$$x=\frac{1}{3}\approx 0.333333333$$

$$y = \frac{3}{2} = 1\frac{1}{2} = 1.5$$

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.

$$3x+2y=4,6x-2y=-1$$

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

$$3x+2y=4$$

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

$$3x=-2y+4$$

Whakawehea ngā taha e rua ki te 3.

$$x=\frac{1}{3}\left(-2y+4\right)$$

Whakareatia \frac{1}{3} ki te -2y+4.

$$x=-\frac{2}{3}y+\frac{4}{3}$$

Whakakapia te \frac{-2y+4}{3} mō te x ki tērā atu whārite, 6x-2y=-1.

$$6\left(-\frac{2}{3}y+\frac{4}{3}\right)-2y=-1$$

Whakareatia 6 ki te \frac{-2y+4}{3}.

$$-4y+8-2y=-1$$

Tāpiri -4y ki te -2y.

$$-6y+8=-1$$

Me tango 8 mai i ngā taha e rua o te whārite.

$$-6y=-9$$

Whakawehea ngā taha e rua ki te -6.

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

Whakaurua te \frac{3}{2} mō y ki x=-\frac{2}{3}y+\frac{4}{3}. I te mea kotahi anake te taurangi kei te whārite i puta, ka taea e koe te whakaoti mō x hāngai tonu.

$$x=-\frac{2}{3}\times \frac{3}{2}+\frac{4}{3}$$

Whakareatia -\frac{2}{3} ki te \frac{3}{2} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro, ka whakaiti i te hautanga ki ngā kīanga tau iti rawa e taea ana.

$$x=-1+\frac{4}{3}$$

Tāpiri \frac{4}{3} ki te -1.

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

Kua oti te pūnaha te whakatau.

$$x=\frac{1}{3},y=\frac{3}{2}$$

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.

$$3x+2y=4,6x-2y=-1$$

Tuhia ngā whārite ki te tikanga tātai poukapa.

$$\left(\begin{matrix}3&2\\6&-2\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}4\\-1\end{matrix}\right)$$

Whakarea mauī i te whārite ki te poukapa kōaro o \left(\begin{matrix}3&2\\6&-2\end{matrix}\right).

$$inverse(\left(\begin{matrix}3&2\\6&-2\end{matrix}\right))\left(\begin{matrix}3&2\\6&-2\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}3&2\\6&-2\end{matrix}\right))\left(\begin{matrix}4\\-1\end{matrix}\right)$$

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

$$\left(\begin{matrix}1&0\\0&1\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}3&2\\6&-2\end{matrix}\right))\left(\begin{matrix}4\\-1\end{matrix}\right)$$

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

$$\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}3&2\\6&-2\end{matrix}\right))\left(\begin{matrix}4\\-1\end{matrix}\right)$$

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.

$$\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}-\frac{2}{3\left(-2\right)-2\times 6}&-\frac{2}{3\left(-2\right)-2\times 6}\\-\frac{6}{3\left(-2\right)-2\times 6}&\frac{3}{3\left(-2\right)-2\times 6}\end{matrix}\right)\left(\begin{matrix}4\\-1\end{matrix}\right)$$

Mahia ngā tātaitanga.

$$\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}\frac{1}{9}&\frac{1}{9}\\\frac{1}{3}&-\frac{1}{6}\end{matrix}\right)\left(\begin{matrix}4\\-1\end{matrix}\right)$$

Whakareatia ngā poukapa.

$$\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}\frac{1}{9}\times 4+\frac{1}{9}\left(-1\right)\\\frac{1}{3}\times 4-\frac{1}{6}\left(-1\right)\end{matrix}\right)$$

Mahia ngā tātaitanga.

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

Tangohia ngā huānga poukapa x me y.

$$x=\frac{1}{3},y=\frac{3}{2}$$

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.

$$3x+2y=4,6x-2y=-1$$

Kia ōrite ai a 3x me 6x, whakareatia ngā kīanga tau katoa kei ia taha o te whārite tuatahi ki te 6 me ngā kīanga tau katoa kei ia taha o te whārite tuarua ki te 3.

$$6\times 3x+6\times 2y=6\times 4,3\times 6x+3\left(-2\right)y=3\left(-1\right)$$

Whakarūnātia.

$$18x+12y=24,18x-6y=-3$$

Me tango 18x-6y=-3 mai i 18x+12y=24 mā te tango i ngā kīanga tau ōrite i ia taha o te tohu ōrite.

$$18x-18x+12y+6y=24+3$$

Tāpiri 18x ki te -18x. Ka whakakore atu ngā kupu 18x me -18x, ka toe he whārite me tētahi taurangi kotahi ka taea te whakaoti.

$$12y+6y=24+3$$

Tāpiri 12y ki te 6y.

$$18y=24+3$$

Tāpiri 24 ki te 3.

$$18y=27$$

Whakawehea ngā taha e rua ki te 18.

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

Whakaurua te \frac{3}{2} mō y ki 6x-2y=-1. I te mea kotahi anake te taurangi kei te whārite i puta, ka taea e koe te whakaoti mō x hāngai tonu.

$$6x-2\times \frac{3}{2}=-1$$

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

$$6x-3=-1$$

Me tāpiri 3 ki ngā taha e rua o te whārite.

$$6x=2$$

Whakawehea ngā taha e rua ki te 6.

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

Kua oti te pūnaha te whakatau.

$$x=\frac{1}{3},y=\frac{3}{2}$$