i really don't understand what to do...

it says to determine the equation of the tangen to the curve

y= 1/x at the point on the curve where x=2 ?????

and then the following question is like to find the equation of the tangent to y=x^2 -2y+5=0 which is perpendicular to the line x-2y+5=0

????? how do u do it wen u hav to hav find it perpendicular to that