Whakaoti i te {l}{-3x+7y=-16}{-9x+5x=16}

$$\left. \begin{array} { l } { - 3 x + 7 y = - 16 } \\ { - 9 x + 5 x = 16 } \end{array} \right.$$

Whakaoti mō x, y

$$x=-4$$

$$y=-4$$

Ngā Upane Otinga

Whakaarohia te whārite tuarua. Pahekotia te -9x me 5x, ka -4x.

$$-4x=16$$

Whakawehea ngā taha e rua ki te -4.

$$x=\frac{16}{-4}$$

Whakawehea te 16 ki te -4, kia riro ko -4.

$$x=-4$$

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

$$-3\left(-4\right)+7y=-16$$

Whakareatia te -3 ki te -4, ka 12.

$$12+7y=-16$$

Tangohia te 12 mai i ngā taha e rua.

$$7y=-16-12$$

Tangohia te 12 i te -16, ka -28.

$$7y=-28$$

Whakawehea ngā taha e rua ki te 7.

$$y=\frac{-28}{7}$$

Whakawehea te -28 ki te 7, kia riro ko -4.

$$y=-4$$

Kua oti te pūnaha te whakatau.

$$x=-4 y=-4$$