Whakaoti i te {l}{a_{2}=3+d}{a_{2}=2(3+a_{2})+3}

$$\left. \begin{array} { l } { a _ { 2 } = 3 + d } \\ { a _ { 2 } = 2 ( 3 + a _ { 2 } ) + 3 } \end{array} \right.$$

Whakaoti mō a_2, d

$$a_{2}=-9$$

$$d=-12$$

Ngā Upane Otinga

Whakaarohia te whārite tuarua. Whakamahia te āhuatanga tohatoha hei whakarea te 2 ki te 3+a_{2}.

$$a_{2}=6+2a_{2}+3$$

Tāpirihia te 6 ki te 3, ka 9.

$$a_{2}=9+2a_{2}$$

Tangohia te 2a_{2} mai i ngā taha e rua.

$$a_{2}-2a_{2}=9$$

Pahekotia te a_{2} me -2a_{2}, ka -a_{2}.

$$-a_{2}=9$$

Whakawehea ngā taha e rua ki te -1.

$$a_{2}=-9$$

Whakaarohia te whārite tuatahi. Me kōkuhu ngā uara tāupe mōhiotia ki te whārite.

$$-9=3+d$$

Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.

$$3+d=-9$$

Tangohia te 3 mai i ngā taha e rua.

$$d=-9-3$$

Tangohia te 3 i te -9, ka -12.

$$d=-12$$

Kua oti te pūnaha te whakatau.

$$a_{2}=-9 d=-12$$