This algebra video tutorial provides a basic introduction into positive and negative slope.

Algebra For Beginners: https://www.youtube.com/watch?v=MHeirBPOI6w

How To Solve Linear Equations:
https://www.youtube.com/watch?v=7DPWeBszNSM

Solving Linear Equations - More Problems:
https://www.youtube.com/watch?v=Z-ZkmpQBIFo

Translating Words to Algebraic Expressions:
https://www.youtube.com/watch?v=QEnFIgN8UBw

Graphing Ordered Pairs:
https://www.youtube.com/watch?v=yaOf7ioCgFQ

How To Find The Slope of a Line:
https://www.youtube.com/watch?v=jlkE4VCnhdE

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Finding The Slope Given 2 Points:
https://www.youtube.com/watch?v=Id_UqMLAXzY

Undefined Slope:
https://www.youtube.com/watch?v=4eYlTOy-IXw

Slope-Intercept Form:
https://www.youtube.com/watch?v=qXX47hS2KLw

Slope-Intercept Form to Standard Form:
https://www.youtube.com/watch?v=mCzVZptDhvU

How To Find the X and Y Intercepts:
https://www.youtube.com/watch?v=zL1E5w2sMxc

Point-Slope Form:
https://www.youtube.com/watch?v=yoHs1h5qtuQ

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Graphing Equations In Point Slope Form:
https://www.youtube.com/watch?v=XzG-fi__hsU

Graphing Horizontal and Vertical Lines:
https://www.youtube.com/watch?v=ADGduYvdFmc

Writing Equations Given a Point & Slope:
https://www.youtube.com/watch?v=Ms5ojdI6UuM

Writing Linear Equations Given 2 Points:
https://www.youtube.com/watch?v=lzqTD0JWwhY

Writing Linear Equations From Graphs:
https://www.youtube.com/watch?v=JaX_dIDUYBg

Finding The Point of Intersection:
https://www.youtube.com/watch?v=R0bGxNzgL2o

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Writing Equations Given X & Y Intercepts:
https://www.youtube.com/watch?v=ri1bagtR08A

Writing Equations In Standard Form:
https://www.youtube.com/watch?v=CN4-ty9e5Jk

Writing Equations Using a Function Table:
https://www.youtube.com/watch?v=DffvEuX1v60

Parallel and Perpendicular Lines:
https://www.youtube.com/watch?v=Uq8pSFaXPmQ

Writing Equations of Perpendicular Lines:
https://www.youtube.com/watch?v=Nj6OKT-zKWg

Linear Equations - Test Review:
https://www.youtube.com/watch?v=Ft2_QtXAnh8

Final Exams and Video Playlists:
https://www.video-tutor.net/