I just finished the Linear Relations unit with my my gr.9 math class. We used iPads to help us create equations and graphs of linear functions. The Desmos Calculator, a free online resource, is a wonderful tool that I used to help the students understand the concept of linear relations.
The students were able to construct table of values from an equation, create graphs from a table or from an equation, and find the point of intersection of two linear equations. We would often use Desmos to check our homework and verify our equations. This was advantageous for me because I did not need to spend as much time correcting our homework. There were no glitches that I witnessed when using Desmos.
Next unit is Analytic geometry. I will definitely use Desmos to help the students understand the relationship between slope and y-intercept (with sliders) and use it to illustrate lines that produce parallel and perpendicular lines. iPads have allowed us to use such resources without the need of a computer lab.
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