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

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

Whakaoti mō y, x

$$x=-4$$

$$y=-7$$

Ngā Upane e Whakamahi ana i te Whakakapinga

Whakaarohia te whārite tuatahi. Tangohia te 2x mai i ngā taha e rua.

$$y-2x=1$$

Whakaarohia te whārite tuarua. Tangohia te x mai i ngā taha e rua.

$$y-x=-3$$

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.

$$y-2x=1,y-x=-3$$

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

$$y-2x=1$$

Me tāpiri 2x ki ngā taha e rua o te whārite.

$$y=2x+1$$

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

$$2x+1-x=-3$$

Tāpiri 2x ki te -x.

$$x+1=-3$$

Me tango 1 mai i ngā taha e rua o te whārite.

$$x=-4$$

Whakaurua te -4 mō x ki y=2x+1. I te mea kotahi anake te taurangi kei te whārite i puta, ka taea e koe te whakaoti mō y hāngai tonu.

$$y=2\left(-4\right)+1$$

Whakareatia 2 ki te -4.

$$y=-8+1$$

Tāpiri 1 ki te -8.

$$y=-7$$

Kua oti te pūnaha te whakatau.

$$y=-7,x=-4$$

Ngā Upane e Whakamahi ana i Ngā Poukapa

Whakaarohia te whārite tuatahi. Tangohia te 2x mai i ngā taha e rua.

$$y-2x=1$$

Whakaarohia te whārite tuarua. Tangohia te x mai i ngā taha e rua.

$$y-x=-3$$

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

$$y-2x=1,y-x=-3$$

Tuhia ngā whārite ki te tikanga tātai poukapa.

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

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

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

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

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

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

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

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.

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

Mahia ngā tātaitanga.

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

Whakareatia ngā poukapa.

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

Mahia ngā tātaitanga.

$$\left(\begin{matrix}y\\x\end{matrix}\right)=\left(\begin{matrix}-7\\-4\end{matrix}\right)$$

Tangohia ngā huānga poukapa y me x.

$$y=-7,x=-4$$

Ngā Upane e Whakamahi i te Tangohanga

Whakaarohia te whārite tuatahi. Tangohia te 2x mai i ngā taha e rua.

$$y-2x=1$$

Whakaarohia te whārite tuarua. Tangohia te x mai i ngā taha e rua.

$$y-x=-3$$

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.

$$y-2x=1,y-x=-3$$

Me tango y-x=-3 mai i y-2x=1 mā te tango i ngā kīanga tau ōrite i ia taha o te tohu ōrite.

$$y-y-2x+x=1+3$$

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

$$-2x+x=1+3$$

Tāpiri -2x ki te x.

$$-x=1+3$$

Tāpiri 1 ki te 3.

$$-x=4$$

Whakawehea ngā taha e rua ki te -1.

$$x=-4$$

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

$$y-\left(-4\right)=-3$$

Whakareatia -1 ki te -4.

$$y+4=-3$$

Me tango 4 mai i ngā taha e rua o te whārite.

$$y=-7$$

Kua oti te pūnaha te whakatau.

$$y=-7,x=-4$$