Make a table and a graph for this situation.
Notice that Martha starts out with
, and with each week she gains .
Do you notice a pattern? Fill in the rest of the table.
Graph these points on your paper. Start at (
). Draw a line through all the data points graphed.
Explain how you can use the table or graph to predict how many weeks it will take Martha to earn enough money to pay for the new computer.
At which point on the graph does the amount of money Martha has equal the cost of the laptop computer?
How can you use the table to predict the amount of time until Martha has enough money?
Use the eTool below to complete the problem.
Click the link at right for the full version of the eTool: MC2 8-88 HW eTool