Question

Решите систему уравнений.

Answer 1

Ответ:

$(frac{1}{2}; 8)$

Пошаговое объяснение:

$left{begin{matrix}3log_{2},x - 4log_{2},y=-15\ 4log_{2},x +3log_{2},y=5end{matrix}right. Leftrightarrow left{begin{matrix}3log_{2},x - 4log_{2},y=-15\ log_{2},x +7log_{2},y=20end{matrix}right. Leftrightarrow$

$left{begin{matrix}60-21log_{2},y - 4log_{2},y=-15\ log_{2},x=20-7log_{2},yend{matrix}right. Leftrightarrow left{begin{matrix}25log_{2},y=75\ log_{2},x=20-7log_{2},yend{matrix}right. Leftrightarrow$

$left{begin{matrix}log_{2},y= 3\ log_{2},x=-1end{matrix}right. Leftrightarrow left{begin{matrix}y= 2^3\ x=2^{-1}end{matrix}right. Leftrightarrow left{begin{matrix}y= 8\ x=frac{1}{2}end{matrix}right.$