It took a few seconds for me to understand what it was graphing. What were those horizontal segments of y = 0 and y = 1? If you are having trouble figuring it out, look at the graph without the inequality graphed on top of the one produced by my student. Can you see it now?

## Tuesday, January 23, 2018

### Teach 180: Boolean Algebra, Graphing Style (Day 90)

When one of my students was taking his PreCalculus exam yesterday, he tried to use his graphing calculator to solve a rational inequality. During the exam, he brought his graphing calculator up to me and asked me why his calculator was showing what it did. On the left, he has the graph and on the right is what he entered. Can you tell what is going on?

It took a few seconds for me to understand what it was graphing. What were those horizontal segments of y = 0 and y = 1? If you are having trouble figuring it out, look at the graph without the inequality graphed on top of the one produced by my student. Can you see it now?

It took a few seconds for me to understand what it was graphing. What were those horizontal segments of y = 0 and y = 1? If you are having trouble figuring it out, look at the graph without the inequality graphed on top of the one produced by my student. Can you see it now?

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