Whakaoti i te (12x+3y)-(12x-20y)=15-81

$$( 12 x + 3 y ) - ( 12 x - 20 y ) = 15 - 81$$

Whakaoti mō y

$$y = -\frac{66}{23} = -2\frac{20}{23} = -2.869565217391304$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Hei kimi i te tauaro o 12x-20y, kimihia te tauaro o ia taurangi.

$$12x+3y-12x+20y=15-81$$

Pahekotia te 12x me -12x, ka 0.

$$3y+20y=15-81$$

Pahekotia te 3y me 20y, ka 23y.

$$23y=15-81$$

Tangohia te 81 i te 15, ka -66.

$$23y=-66$$

Whakawehea ngā taha e rua ki te 23.

$$y=\frac{-66}{23}$$

Ka taea te hautanga \frac{-66}{23} te tuhi anō ko -\frac{66}{23} mā te tango i te tohu tōraro.

$$y=-\frac{66}{23}$$

Whakaoti mō x (complex solution)

$$x\in \mathrm{C}$$

$$y = -\frac{66}{23} = -2\frac{20}{23} = -2.869565217391304$$

Whakaoti mō x

$$x\in \mathrm{R}$$

$$y = -\frac{66}{23} = -2\frac{20}{23} = -2.869565217391304$$