## Friday, October 11, 2013

### Slope, Distance and More

Ski Vacation? Nope, this is serious stuff; it’s about finding the slope of a line, finding the equation of a line with a given slope, finding the equation of the tangent line to a function, finding the distance between two points, finding the quadrant of a point, finding the midpoint of a line segment.  That’s a lot of lines and points, and functions too.

Basically, you have to follow the rules, no tricks, just knowing how to use it all.   We’ve added the line features to help you sort this through…step by step

Find the equation of a line given a point and slope m (click here):

All it takes is solving a linear equation to compute the y=intercept b

Let’s continue with the most challenging one, the tangent line.  It is only challenging b/c it requires derivation, and it is using all the line features we’ve seen so far.  So we have a function and a point, we have to start by finding the slope (that’s where we derivate), compute the slope at a given point, now we can find the tangent line ( slope + point = line)