Whakaoti i te {l}{x/990=8.89}{x/990-y=9.9}

$$\left. \begin{array} { l } { \frac { x } { 990 } = 8.89 } \\ { \frac { x } { 990 - y } = 9.9 } \end{array} \right.$$

Whakaoti mō x, y

$$x=8801.1$$

$$y=101$$

Ngā Upane Otinga

Whakaarohia te whārite tuatahi. Me whakarea ngā taha e rua ki te 990.

$$x=8.89\times 990$$

Whakareatia te 8.89 ki te 990, ka 8801.1.

$$x=8801.1$$

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

$$\frac{8801.1}{990-y}=9.9$$

Tē taea kia ōrite te tāupe y ki 990 nā te kore tautuhi i te whakawehenga mā te kore. Whakareatia ngā taha e rua o te whārite ki te -y+990.

$$8801.1=9.9\left(-y+990\right)$$

Whakamahia te āhuatanga tohatoha hei whakarea te 9.9 ki te -y+990.

$$8801.1=-9.9y+9801$$

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

$$-9.9y+9801=8801.1$$

Tangohia te 9801 mai i ngā taha e rua.

$$-9.9y=8801.1-9801$$

Tangohia te 9801 i te 8801.1, ka -999.9.

$$-9.9y=-999.9$$

Whakawehea ngā taha e rua ki te -9.9.

$$y=\frac{-999.9}{-9.9}$$

Whakarohaina te \frac{-999.9}{-9.9} mā te whakarea i te taurunga me te tauraro ki te 10.

$$y=\frac{-9999}{-99}$$

Whakawehea te -9999 ki te -99, kia riro ko 101.

$$y=101$$

Kua oti te pūnaha te whakatau.

$$x=8801.1 y=101$$