Whakaoti mō n
n=\frac{91-y}{2}
Whakaoti mō y
y=91-2n
Graph
Tohaina
Kua tāruatia ki te papatopenga
n+y+n=91
Me tāpiri te n ki ngā taha e rua.
2n+y=91
Pahekotia te n me n, ka 2n.
2n=91-y
Tangohia te y mai i ngā taha e rua.
\frac{2n}{2}=\frac{91-y}{2}
Whakawehea ngā taha e rua ki te 2.
n=\frac{91-y}{2}
Mā te whakawehe ki te 2 ka wetekia te whakareanga ki te 2.
y=91-n-n
Tangohia te n mai i ngā taha e rua.
y=91-2n
Pahekotia te -n me -n, ka -2n.
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