Digital Portfolio: MAP's - Baseball Jersey with Desmos

Last week in Algebra (well the week before retreat) we started our unit on graphing linear equations. Generally we begin with tables and move quickly toward graphing via intercepts, the slope formula and slope-intercept.

This year being my first time through with truly interleaved daily problem sets, they had already had several opportunities to remember from pre-algebra graphing via tables and calculating slope via counting rise over run from a graph. Hence, right away we were able to dig in to more detailed tasks. On day 1 after playing polygraph (lines), they began thinking about MAP's Comparing Value for Money: Baseball Jerseys.

From: http://map.mathshell.org/lessons.php?collection=8&unit=8200

They worked in pairs and quickly established that the price per t-shirt corresponds to the slope and that the one-off print set cost was the y-intercept. Actually graphing on paper was harder as I gave them a graph that went from 0 - 500 for the range and 0 to 25 for the domain... they struggled with accuracy. Luckily, we have Desmos.

Desmos also made testing their ideas for the 2nd task of finding the middle range pricing plan a bit easier.

Since they already had their computers out, I had them blog about it.

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