Some groups were quick to choose a price and start working with it. Other found 40% of 15 and 50% of 25 and chose the smaller number :(. I asked what those numbers meant and eventually got them headed in the right direction. When the first group finished I asked if the price of the book made any difference? Was there better deal always a better deal regardless of book price.

Once groups finished I asked them to do the following:

I talked individually with groups about what they knew about the y-intercept. We arrived at the fact that they x-coordinate was always 0 and off they went. Having never done this before some groups struggled a bit. I brought the class together for a couple of minutes and we talked about what it means to be an x- or y-intercept. They went off and completed the questions above in their groups. When they were done they worked on question 2 from yesterday's handout. After everyone was done the questions above we consolidated and wrote a quick note. Students then finished up the practice questions.

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