Question

Решите пожалуйста!!!!

Answer 1

$1)\; \; \; y=4-5x\\\\(1;-1)\, :\; \; y(1)=4-5\cdot 1=-1\; ,\; \; -1=-1\\\\(-25;129)\, :\; \; y(-25)=4-5\cdot (-25)=129\; ,\; \; 129=129\\\\(-1;1)\, :\; \; y(-1)=4-5\cdot (-1)=9\; ,\; \; 9\ne 1\\\\(4;-16)\, :\; \; y(4)=4-5\cdot 4=-16\; ,\; \; -16=-16$

Точка (-1;1) не принадлежат графику функции.

$2)\; \; \frac{\sqrt5}{5}=\frac{1}{\sqrt5}\approx 0,447\\\\\frac{5}{\sqrt5}=\sqrt5\approx 2,236\\\\\frac{1}{5}=0,2\\\\1,5=\frac{3}{2}\\\\\frac{1}{5}<\frac{\sqrt5}{5}<1,5<\frac{5}{\sqrt5}$