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0,0 means 0 milkshakes and 0  a. yes, because in the graph the line is a linear function, and also because the price of a milkshake would not change, so it is constant.

b. It means that they have not sold any milkshakes yet, therefore they have made no money

c. $1.50 per milkshake

d. (10,15)

6.In a graph, the points (1, r) and (0,0) must appear on the line of the proportional relationship. ... If a graph of a line passes through the origin and contains the point (1, r), r representing the unit rate, then the relationship is proportional.

Step-by-step explanation: