Whakaoti i te -2(-9y+7)-2y=4(y-2)-9

$$- 2 ( - 9 y + 7 ) - 2 y = 4 ( y - 2 ) - 9$$

Whakaoti mō y

$$y=-\frac{1}{4}=-0.25$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakamahia te āhuatanga tohatoha hei whakarea te -2 ki te -9y+7.

$$18y-14-2y=4\left(y-2\right)-9$$

Pahekotia te 18y me -2y, ka 16y.

$$16y-14=4\left(y-2\right)-9$$

Whakamahia te āhuatanga tohatoha hei whakarea te 4 ki te y-2.

$$16y-14=4y-8-9$$

Tangohia te 9 i te -8, ka -17.

$$16y-14=4y-17$$

Tangohia te 4y mai i ngā taha e rua.

$$16y-14-4y=-17$$

Pahekotia te 16y me -4y, ka 12y.

$$12y-14=-17$$

Me tāpiri te 14 ki ngā taha e rua.

$$12y=-17+14$$

Tāpirihia te -17 ki te 14, ka -3.

$$12y=-3$$

Whakawehea ngā taha e rua ki te 12.

$$y=\frac{-3}{12}$$

Whakahekea te hautanga \frac{-3}{12} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 3.

$$y=-\frac{1}{4}$$