Answer:
y=x
Step-by-step explanation:
Since there are 5 numbers, the median will be the middle number.
examples of answers to this question: 6 7 7 7 7 (median is 7)
1 2 7 7 9 (median is 7)
2 3 7 8 9 (median is 7)
Rise over run! Y2-Y1/X2-X1
An equation has infinitely many solutions if it can be manipulated all the way to an identity (i.e. an equality where the right and left hand side are the same). We have:
A) 
which is impossible
B) 
which is an equality
C) 
which has a unique solution
D) 
which has a unique solution