Whakaoti i te {l}{21x+124=84-11}{7x+4y=28-6}

$$\left. \begin{array} { l } { 21 x + 124 = 84 - 11 } \\ { 7 x + 4 y = 28 - 6 } \end{array} \right.$$

Whakaoti mō x, y

$$x = -\frac{17}{7} = -2\frac{3}{7} \approx -2.428571429$$

$$y = \frac{39}{4} = 9\frac{3}{4} = 9.75$$

Ngā Upane Otinga

Whakaarohia te whārite tuatahi. Tangohia te 11 i te 84, ka 73.

$$21x+124=73$$

Tangohia te 124 mai i ngā taha e rua.

$$21x=73-124$$

Tangohia te 124 i te 73, ka -51.

$$21x=-51$$

Whakawehea ngā taha e rua ki te 21.

$$x=\frac{-51}{21}$$

Whakahekea te hautanga \frac{-51}{21} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 3.

$$x=-\frac{17}{7}$$

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

$$7\left(-\frac{17}{7}\right)+4y=28-6$$

Whakareatia te 7 ki te -\frac{17}{7}, ka -17.

$$-17+4y=28-6$$

Tangohia te 6 i te 28, ka 22.

$$-17+4y=22$$

Me tāpiri te 17 ki ngā taha e rua.

$$4y=22+17$$

Tāpirihia te 22 ki te 17, ka 39.

$$4y=39$$

Whakawehea ngā taha e rua ki te 4.

$$y=\frac{39}{4}$$

Kua oti te pūnaha te whakatau.

$$x=-\frac{17}{7} y=\frac{39}{4}$$