Changed implementation of slope calculation

[Haarush2006]

Fix/

Changed implementation of slope calculation
Added cross product logic instead of math slope formula

fixes #1815

• Fix a bug or typo in an existing algorithm?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new JavaScript files are placed inside an existing directory.
• All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames.
  Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
• All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.91%. Comparing base (08d8c6b) to head (914e525).

Additional details and impacted files

@@ Coverage Diff @@ ## master #1847 +/- ## ========================================== - Coverage 85.91% 85.91% -0.01%  ========================================== Files 379 379 Lines 19778 19772 -6 Branches 3015 3014 -1 ========================================== - Hits 16993 16987 -6  Misses 2785 2785 

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[Haarush2006]

@appgurueu
@raklaptudirm
pls review my pr