Layton measures the voltage across different numbers of batteries placed end to end. He records his data in a table.

a. Let x represent the number of batteries, and let y represent the voltage. Find the slope of a line approximating these data. Be sure to include units with your answer.
b. Which points did you use and why? What is the real-world meaning of this slope?
c. Does it make sense that the y-intercept of the line is 0? Explain why or why not.

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Number of batteries2 3 4 5 678 Voltage (volts 1.43 2.94 4.32 5.88 7.39 8.82 10.27 11.70