Whakaoti mō x
x=\frac{-y-21}{2}
Whakaoti mō y
y=-2x-21
Graph
Tohaina
Kua tāruatia ki te papatopenga
-2x-21=y
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
-2x=y+21
Me tāpiri te 21 ki ngā taha e rua.
\frac{-2x}{-2}=\frac{y+21}{-2}
Whakawehea ngā taha e rua ki te -2.
x=\frac{y+21}{-2}
Mā te whakawehe ki te -2 ka wetekia te whakareanga ki te -2.
x=\frac{-y-21}{2}
Whakawehe y+21 ki te -2.
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