This graph shows the relationship between the pounds of cheese bought at a deli and the total cost, in dollars, for the cheese. Identify the constant of proportionality represented in the graph.

Answer:
y = 4x
Step-by-step explanation:
formula is y=kx, where k is factor of proportionality
Looking at the graph where y and x meet...
2/0.5 = 4 so 2 = 4(0.5)
Therefore, 4 is k (constant)
4=4(1)
6=4(1.5)
10=4(2.5)
and so on...