Read this first! This is a introduction to interval notation using line graphs. It is also an experiment in education. That is, my belief that naked videos are inadequate to the task of teaching. That they need to be embedded in a web page that reinforces...

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Exploit or hack? Not sure. But the cover-up method utterly transforms these problems. It is a nice change of perspective. And I use it here, to teach the correct underlying technique. So it is a twofer......

From mathhacker

This video makes the case for how simplifications of complex fractions should be taught in grammar school, high school, and calculus. For a web page that explains the step see here: http://bit.ly/dEgu0v...

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Given the equation of a line: 7y - kx = 9....
And two points that define another line: (2,-1) and (-4,5),
find the value of k that makes the two lines perpendicular...
(This is problem 112 in Section 2.5 of the Intermediate Algebra (Concepts and Ap...

From mathhacker

The lazy man's way to finding slope and intercept. Once a line is in standard form, and you know the hack, you can do it in your head. This proves valuable when working with systems of equations as Part 2 will show......

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This was probably the third most missed problem on the homework section. A lot of you were on the right path but didn't follow it out to the end. That is, note the moves that lead to the cancellations of the "b" at the end....

From mathhacker

Probably the most missed problem in Ch 2: At what point will the line passing through (a,-1) and (a,5) intersect the line passing through (-3,b) and (2,b)?...

From mathhacker