Whakaoti mō y
y = -\frac{13}{2} = -6\frac{1}{2} = -6.5
Graph
Tohaina
Kua tāruatia ki te papatopenga
7y+21=5y+8
Whakamahia te āhuatanga tohatoha hei whakarea te 7 ki te y+3.
7y+21-5y=8
Tangohia te 5y mai i ngā taha e rua.
2y+21=8
Pahekotia te 7y me -5y, ka 2y.
2y=8-21
Tangohia te 21 mai i ngā taha e rua.
2y=-13
Tangohia te 21 i te 8, ka -13.
y=\frac{-13}{2}
Whakawehea ngā taha e rua ki te 2.
y=-\frac{13}{2}
Ka taea te hautanga \frac{-13}{2} te tuhi anō ko -\frac{13}{2} mā te tango i te tohu tōraro.
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