Question

find the variation constant and an equation of variation when y varies inversely as x and 7=7 when x =11

Answer 1

y=k/x
k=yx

Answer 2

y = k /x

when y =7 (I thing that's what you meant) ,

7 = k / 11

k = 77

y =k /x

y = 77/x

Answer 3

should be when y =7 when x=11

Answer 4

You should better start doing it on your own. :]