Question

please help with functions

Answer 1

do you know a definition for a function?

Answer 2

each input value of x (on the domain) must give at most one y value

Answer 3

in this case (h,d) are like (x,y)

Answer 4

if you plot d(h) what shaped solution do you expect?

Answer 5

if it was

y(x)=mx + b

do you know the shape you would get?

Answer 6

yes

Answer 7

(the only type of straight line that is not a function, is a vertical line)
is this relation a vertical line?