Whakaoti i te 7-(3.1-0.1y)=3-0.2y

$$7 - ( 3.1 - 0.1 y ) = 3 - 0.2 y$$

Whakaoti mō y

$$y=-3$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Hei kimi i te tauaro o 3.1-0.1y, kimihia te tauaro o ia taurangi.

$$7-3.1-\left(-0.1y\right)=3-0.2y$$

Ko te tauaro o -0.1y ko 0.1y.

$$7-3.1+0.1y=3-0.2y$$

Tangohia te 3.1 i te 7, ka 3.9.

$$3.9+0.1y=3-0.2y$$

Me tāpiri te 0.2y ki ngā taha e rua.

$$3.9+0.1y+0.2y=3$$

Pahekotia te 0.1y me 0.2y, ka 0.3y.

$$3.9+0.3y=3$$

Tangohia te 3.9 mai i ngā taha e rua.

$$0.3y=3-3.9$$

Tangohia te 3.9 i te 3, ka -0.9.

$$0.3y=-0.9$$

Whakawehea ngā taha e rua ki te 0.3.

$$y=\frac{-0.9}{0.3}$$

Whakarohaina te \frac{-0.9}{0.3} mā te whakarea i te taurunga me te tauraro ki te 10.

$$y=\frac{-9}{3}$$

Whakawehea te -9 ki te 3, kia riro ko -3.

$$y=-3$$