John bought 6 dumplings for $3.00. let x represent the number of dumplings purchased, and let y represent the total cost. graph the line that represents the proportional relationship.

We know that each dumpling cost $3, and  represents the number of purchased dumplings. So the total cost of some purchased dumplings will be . Since we also know that  also represents the total cost, we can equate them to find the equation of our proportional relationship:

Now that we have our equation, to graph our line we are going to choose tow values for , then get the values of  for each value of , and then join the tow pair of points using a line:
- If , , so our first pair is (6,18)
- If , , so our second pair is (0,0). 

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