We have
.
To find inverse function
we substitute x with
and vice-versa to get

Now solve for
. Note that I will use
instead.

So we find that
.
Hope this helps.
X = k x y
21 = k x 3
k = 7
x = 7y
x = 7(10)
x = 70
How am i supposed to draw it ??
7.2 will be the answer
we use phyagerous thereom
D^2 = 6^2 + 4^2
= sq. root of 52
= 7.2
hope it help\ed