Whakaoti mō x
x=-5
Graph
Tohaina
Kua tāruatia ki te papatopenga
31=x-3x+21
Whakamahia te āhuatanga tohatoha hei whakarea te -3 ki te x-7.
31=-2x+21
Pahekotia te x me -3x, ka -2x.
-2x+21=31
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
-2x=31-21
Tangohia te 21 mai i ngā taha e rua.
-2x=10
Tangohia te 21 i te 31, ka 10.
x=\frac{10}{-2}
Whakawehea ngā taha e rua ki te -2.
x=-5
Whakawehea te 10 ki te -2, kia riro ko -5.
Ngā Tauira
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\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
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Whakarerekētanga
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