решите систему уравнений
[tex] \left \{ {{ \frac{1}{ \sqrt{4x+5y} }=1} \atop {4x-5y=-9}} \right. [/tex]
[tex] \left \{ {{ \frac{1}{ \sqrt{4x+5y} }=1} \atop {4x-5y=-9}} \right. [/tex]
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1/√(4x+5y)=1⇒√(4x+5y)=1⇒4x+5y=14x-5y=-9
прибавим
8x=-8
x=-1
-4+5y=1
5y=5
y=1
(-1;1)