Whakaoti mō x
x=-\frac{8y}{3}+120
Whakaoti mō y
y=-\frac{3x}{8}+45
Graph
Tohaina
Kua tāruatia ki te papatopenga
7.5x=900-20y
Tangohia te 20y mai i ngā taha e rua.
\frac{7.5x}{7.5}=\frac{900-20y}{7.5}
Whakawehea ngā taha e rua o te whārite ki te 7.5, he ōrite ki te whakarea i ngā taha e rua ki te tau huripoki o te hautanga.
x=\frac{900-20y}{7.5}
Mā te whakawehe ki te 7.5 ka wetekia te whakareanga ki te 7.5.
x=-\frac{8y}{3}+120
Whakawehe 900-20y ki te 7.5 mā te whakarea 900-20y ki te tau huripoki o 7.5.
20y=900-7.5x
Tangohia te 7.5x mai i ngā taha e rua.
20y=-\frac{15x}{2}+900
He hanga arowhānui tō te whārite.
\frac{20y}{20}=\frac{-\frac{15x}{2}+900}{20}
Whakawehea ngā taha e rua ki te 20.
y=\frac{-\frac{15x}{2}+900}{20}
Mā te whakawehe ki te 20 ka wetekia te whakareanga ki te 20.
y=-\frac{3x}{8}+45
Whakawehe 900-\frac{15x}{2} ki te 20.
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