derivative of the given function dy/dx= 2/x^3 (nx^[n1])so the slope's = 2/x^3when x=1 (from point 1,1)slope = 2/1 = 2so the equation of a line as we know y=mx+cwhen passing thru one pointyy1=m(xx1)y1=1;x1=1 (from the point given)slope m we have found out = 2so the equation of the line : y1= 2(x1) => y1= 2x+2 =>y+2x= 2 (bringing x to left,and 2 to right)or 2x+y = 2hope its fully clear now
