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Whakaoti mō x
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Whakaoti mō y
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Tohaina

2x=4-y
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
\frac{2x}{2}=\frac{4-y}{2}
Whakawehea ngā taha e rua ki te 2.
x=\frac{4-y}{2}
Mā te whakawehe ki te 2 ka wetekia te whakareanga ki te 2.
x=-\frac{y}{2}+2
Whakawehe 4-y ki te 2.
-y=2x-4
Tangohia te 4 mai i ngā taha e rua.
\frac{-y}{-1}=\frac{2x-4}{-1}
Whakawehea ngā taha e rua ki te -1.
y=\frac{2x-4}{-1}
Mā te whakawehe ki te -1 ka wetekia te whakareanga ki te -1.
y=4-2x
Whakawehe -4+2x ki te -1.