AIM: How can we tell if a linear relationship is increasing or decreasing?
HW: Unit 4 ACE#10,12; pp.19-20
A woman has $40 in her bank account and deposits $20 each week.
Is the relationship between weeks and money in the account linear? Explain.
If it is, is the line increasing or decreasing?
Ans: Yes, the relationship is linear because there is a constant rate of change, in this case, $20 per week. Since the money is being deposited, the amount of money is increasing, because when money is put into a bank, the account increased.
Classwork: We applied our knowledge of linear relationships to look at relationships with negative rates of change. We used the example of having $144 in a bank account and withdrawing $12 each week. Students sketched graphs, assigned variables, and wrote equations to model the situation.