Graphing points and calculating slope?

Question

I have tried to figure this out in my book but I am just not getting it. A few of my questions are:

P=10 - 2qD (put qD on the X axis)

P=100 -4qD (put qD on the X axis)

P=50 + qs (put qs on the x axis)

I = 10,000 - 500r (put I on the x axis)

This is an online class, so I don't have a lot of resources or any help to understand this. I'm not asking for someone to DO them for me...but if there is anyone who could explain how to do it, I would appreciate it!

Thanks!

Answer 1

Not sure if you want calculating the slope from the equation, or if you mean calculating the slope from looking at a graph.

If calcuating from the equation, these are the answers:

1.   -2

2.   -4

3.    1

4.    -500

For an explanation of Plotting Points:

http://www.coolmath.com/algebra/Algebra1...

What's the Slope of a Line?

http://www.coolmath.com/algebra/Algebra1...

Finding the Slope of a Line From the Graph

http://www.coolmath.com/algebra/Algebra1...