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15-07-2014
Mathematics

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Help please 2y-5x=-1, x=2y+5

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Аноним Аноним

15-07-2014

[tex]\left\{\begin{array}{ccc}2y-5x=-1\\x=2y+5\end{array}\right\\\\substitute\\\\2y-5(2y+5)=-1\\2y-10y-25=-1\\-8y=-1+25\\-8y=24\ \ \ \ /:(-8)\\y=-3\\\\x=2\cdot(-3)+5=-6+5=-1\\\\Solution:x=-1;\ y=-3[/tex]

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