A. The median of the data set is 10
Yes, these both are direct relationships and can be written like

, where k is the constant of variation.
For the first equation, k = 10. For the second equation, k = -4/3. You find it by rearranging the equation into the form

, and you use the coefficient of x for k.
Answer:160 dimes
Step-by-step explanation:
7 dimes= 70 cents
9 dimes= 90 cents
70+90=160