If y varies directly with x and y = 25 when x = 5, what is the value of k? how does this work when y = kx?

The value of k when x=5 and y=25 is:

                              k=5

Direct variation--

Two variables are said to be in direct variation if one variable could be written as a constant multiple of the other variable.

i.e. x and y are said to be in direct variation.

if there exist a constant k such that:

or if x is non-zero then we have:

Here we are given x=5 and y=25

This means that the value of k is:

answer:      

step-by-step explanation:

48 / 6 = x

in this case, x will equal the amount of money in each card!

x therefore will be 8.

trent had $8 in each birthday card.