Question

The graph shows the amount of money paid when purchasing bags of peanuts at the zoo: A graph is shown. The x-axis is labeled from 0 to 9. The y-axis is labeled from 0 to 13. The four points shown on the graph are ordered pairs 0, 0 and 1, 4 and 2, 8 and 3, 12. These points are joined by a line. The label on the x-axis is Bags of peanuts. The title on the y-axis is Total cost in dollars. Write an equation to represent the relationship between the total cost (y) and the number of bags of peanuts (x).

Answer 1

y = 4x._____

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Answer 2

Clearly, y = 4x.

_____
The cost is proportional to the number of bags, so you really only need one point to determine the constant of proportionality. The point (1, 4) will tell you directly what the cost of 1 bag of peanuts is.