Changes

==Useful websites==

==Useful websites==

[For more information about Slope click this http://www.virtualnerd.com/algebra-1/linear-equation-analysis/slope-rate-of-change/understanding-slope/negative-slope-definition]

[For more information about Slope click this ://www.virtualnerd.com/algebra-1/linear-equation-analysis/slope-rate-of-change/understanding-slope/negative-slope-definition]

==Reference Books==

==Reference Books==