Whakaoti mō z
z\leq \frac{8}{21}
Tohaina
Kua tāruatia ki te papatopenga
-4z+31-17z\geq 23
Tangohia te 17z mai i ngā taha e rua.
-21z+31\geq 23
Pahekotia te -4z me -17z, ka -21z.
-21z\geq 23-31
Tangohia te 31 mai i ngā taha e rua.
-21z\geq -8
Tangohia te 31 i te 23, ka -8.
z\leq \frac{-8}{-21}
Whakawehea ngā taha e rua ki te -21. I te mea he tōraro a -21, ka huri te ahunga koreōrite.
z\leq \frac{8}{21}
Ka taea te hautanga \frac{-8}{-21} te whakamāmā ki te \frac{8}{21} mā te tango tahi i te tohu tōraro i te taurunga me te tauraro.
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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