Whakaoti i te 21/6*3=-y

$$2 \frac { 1 } { 6 } \times 3 = - y$$

Whakaoti mō y

$$y = -\frac{13}{2} = -6\frac{1}{2} = -6.5$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakareatia ngā taha e rua o te whārite ki te 6.

$$\left(2\times 6+1\right)\times 3=-6y$$

Whakareatia te 2 ki te 6, ka 12.

$$\left(12+1\right)\times 3=-6y$$

Tāpirihia te 12 ki te 1, ka 13.

$$13\times 3=-6y$$

Whakareatia te 13 ki te 3, ka 39.

$$39=-6y$$

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

$$-6y=39$$

Whakawehea ngā taha e rua ki te -6.

$$y=\frac{39}{-6}$$

Whakahekea te hautanga \frac{39}{-6} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 3.

$$y=-\frac{13}{2}$$