Whakaoti mō y_x
y_{x}=s_{y}-7
Whakaoti mō s_y
s_{y}=y_{x}+7
Tohaina
Kua tāruatia ki te papatopenga
-y_{x}=7-s_{y}
Tangohia te s_{y} mai i ngā taha e rua.
\frac{-y_{x}}{-1}=\frac{7-s_{y}}{-1}
Whakawehea ngā taha e rua ki te -1.
y_{x}=\frac{7-s_{y}}{-1}
Mā te whakawehe ki te -1 ka wetekia te whakareanga ki te -1.
y_{x}=s_{y}-7
Whakawehe 7-s_{y} ki te -1.
s_{y}=7+y_{x}
Me tāpiri te y_{x} ki ngā taha e rua.
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