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Whakaoti mō x, y
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x+2y=2,x-y=-4
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+2y=2
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=-2y+2
Me tango 2y mai i ngā taha e rua o te whārite.
-2y+2-y=-4
Whakakapia te -2y+2 mō te x ki tērā atu whārite, x-y=-4.
-3y+2=-4
Tāpiri -2y ki te -y.
-3y=-6
Me tango 2 mai i ngā taha e rua o te whārite.
y=2
Whakawehea ngā taha e rua ki te -3.
x=-2\times 2+2
Whakaurua te 2 mō y ki x=-2y+2. I te mea kotahi anake te taurangi kei te whārite i puta, ka taea e koe te whakaoti mō x hāngai tonu.
x=-4+2
Whakareatia -2 ki te 2.
x=-2
Tāpiri 2 ki te -4.
x=-2,y=2
Kua oti te pūnaha te whakatau.
x+2y=2,x-y=-4
Tuhia ngā whārite ki te tānga ngahuru ka whakamahi i ngā poukapa hei whakaoti i te pūnaha o ngā whārite.
\left(\begin{matrix}1&2\\1&-1\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}2\\-4\end{matrix}\right)
Tuhia ngā whārite ki te tikanga tātai poukapa.
inverse(\left(\begin{matrix}1&2\\1&-1\end{matrix}\right))\left(\begin{matrix}1&2\\1&-1\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}1&2\\1&-1\end{matrix}\right))\left(\begin{matrix}2\\-4\end{matrix}\right)
Whakarea mauī i te whārite ki te poukapa kōaro o \left(\begin{matrix}1&2\\1&-1\end{matrix}\right).
\left(\begin{matrix}1&0\\0&1\end{matrix}\right)\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}1&2\\1&-1\end{matrix}\right))\left(\begin{matrix}2\\-4\end{matrix}\right)
Ko te hua o tētahi poukapa me te kōaro ko te poukapa tuakiri.
\left(\begin{matrix}x\\y\end{matrix}\right)=inverse(\left(\begin{matrix}1&2\\1&-1\end{matrix}\right))\left(\begin{matrix}2\\-4\end{matrix}\right)
Whakareatia ngā poukapa kei te taha mauī o te tohu ōrite.
\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}-\frac{1}{-1-2}&-\frac{2}{-1-2}\\-\frac{1}{-1-2}&\frac{1}{-1-2}\end{matrix}\right)\left(\begin{matrix}2\\-4\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{1}{3}&\frac{2}{3}\\\frac{1}{3}&-\frac{1}{3}\end{matrix}\right)\left(\begin{matrix}2\\-4\end{matrix}\right)
Mahia ngā tātaitanga.
\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}\frac{1}{3}\times 2+\frac{2}{3}\left(-4\right)\\\frac{1}{3}\times 2-\frac{1}{3}\left(-4\right)\end{matrix}\right)
Whakareatia ngā poukapa.
\left(\begin{matrix}x\\y\end{matrix}\right)=\left(\begin{matrix}-2\\2\end{matrix}\right)
Mahia ngā tātaitanga.
x=-2,y=2
Tangohia ngā huānga poukapa x me y.
x+2y=2,x-y=-4
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-x+2y+y=2+4
Me tango x-y=-4 mai i x+2y=2 mā te tango i ngā kīanga tau ōrite i ia taha o te tohu ōrite.
2y+y=2+4
Tāpiri x ki te -x. Ka whakakore atu ngā kupu x me -x, ka toe he whārite me tētahi taurangi kotahi ka taea te whakaoti.
3y=2+4
Tāpiri 2y ki te y.
3y=6
Tāpiri 2 ki te 4.
y=2
Whakawehea ngā taha e rua ki te 3.
x-2=-4
Whakaurua te 2 mō y ki x-y=-4. I te mea kotahi anake te taurangi kei te whārite i puta, ka taea e koe te whakaoti mō x hāngai tonu.
x=-2
Me tāpiri 2 ki ngā taha e rua o te whārite.
x=-2,y=2
Kua oti te pūnaha te whakatau.