Question

решить систему ://
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Answer 1

$\left \{ {{(\frac{1}{5})^{4x-y}=25} \atop {7^{9x-y}=\sqrt{7}}} \right.\\\\\left \{ {{5^{y-4x}=5^{2}} \atop {7^{9x-y}=7^{0,5}}} \right.\\\\+\left \{ {{-4x+y=2} \atop {9x-y=0,5}} \right.$

__________

5x = 2,5

x= 0,5

y = 2 + 4x = 2 + 4 * 0,5 = 2 + 2 = 4

Ответ : (0,5 ; 4)