title: Program Find Slope Line
signature: function program_find_slope_line(x1, y1, x2, y2)
test_code: 
  
  -- SOLUTION CODE
  -- ============================================
  PLACEHOLDER_CODE_BODY
  
  -- TESTING CODE 
  -- ============================================
  function isCorrect(actual, expected)
      if type(expected) ~= type(actual) then
          return false
      end
      
      if type(expected) == 'table' then
          for k,v_expected in pairs(expected) do
              
              if actual[k] == nil then
                  return false
              end
              local v_actual = actual[k]
              if not isCorrect(v_actual, v_expected) then
                  return false
              end
              actual[k]=nil
          end
      
          if next(actual) then 
              return false
          end
          return true
      else
          return actual == expected
      end
  end
  
  function validateSolution(actual, expected)
      return math.abs(actual - expected) < 1e-09
  end
  
  function driver(x1, y1, x2, y2, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(x1, y1, x2, y2) 
      end)
      if status then
          if validateSolution(exec_result,expected) then
              return "PASSED"
          end
          return "FAILED"
      else
          return string.format("ERROR=%s",string.gsub(error_msg,".*:[%d]+: ",""))
      end
  end
      
  function main()
      result = driver(236.27324548309292, 5792.493225762838, 7177.837879115863, 1289.5700425822731, -0.6486899453998202)
      print(string.format("TEST-0...%s",result))
  
      result = driver(-9201.144918204123, -2716.3347716140406, -5161.142121227645, -3205.784279961129, -0.12115078452752318)
      print(string.format("TEST-1...%s",result))
  
      result = driver(3480.4716834445326, 3577.9608612055613, 8611.515262945342, 6744.864707668983, 0.617204628531244)
      print(string.format("TEST-2...%s",result))
  
      result = driver(-6915.538971485092, -4113.601103381095, -748.3462104020822, -9245.271700539257, -0.8320918116165706)
      print(string.format("TEST-3...%s",result))
  
      result = driver(8887.97173657486, 1678.4080012662428, 8709.574949883017, 8548.492675510739, -38.51013687881985)
      print(string.format("TEST-4...%s",result))
  
      result = driver(-3785.5177159369946, -3084.67461899163, -7415.76208254121, -887.5389305564152, -0.6052307962095809)
      print(string.format("TEST-5...%s",result))
  
      result = driver(3037.6696554256832, 4432.445827549, 8387.304165588026, 611.3373507518394, -0.7142746798007333)
      print(string.format("TEST-6...%s",result))
  
      result = driver(-7925.458496016523, -3350.27411882042, -5619.767086756504, -1185.7423219907591, 0.9387777514963889)
      print(string.format("TEST-7...%s",result))
  
      result = driver(1404.2919985268031, 8971.636233373416, 3039.112051378511, 1947.6756252708972, -4.2964732392719505)
      print(string.format("TEST-8...%s",result))
  
      result = driver(-4748.744241168378, -675.557388148954, -5998.241086029875, -4236.658178504375, 2.85002783720527)
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
source_py: def program_find_slope_line(x1, y1, x2, y2):
      return (float((y2 - y1)) / (x2 - x1))
source_cpp: float program_find_slope_line(float x1, float y1, float x2, float y2) {
    return ( y2 - y1 ) / ( x2 - x1 );
  }