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Решите систему уравнений.
[tex] \left \{ {{x^2-y^2=15} \atop {x-y=5}} \right. [/tex]
Решите систему уравнений.
[tex] \left \{ {{x^2-y^2=15} \atop {x-y=5}} \right. [/tex]
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Answers & Comments
x-y=5
(x-y)(x+y)=15
x-y=5
5(x+y)=15
x+y=3
x=4
y=1