title: Program Find Slope Line
signature: pub fn program_find_slope_line(x1: f64, y1: f64, x2: f64, y2: f64) -> f64 {
test_code: use std::collections::HashMap;
  use std::collections::HashSet;
  use std::cmp::*;
  use std::collections::*;
  use std::fmt::*; 
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  pub fn validate_solution(actual: f64, expected: f64)->bool{
  return (actual - expected).abs() < 1e-09
  }
  pub fn driver(x1: f64, y1: f64, x2: f64, y2: f64, expected: f64)->String{
      if validate_solution(PLACEHOLDER_FN_NAME(x1, y1, x2, y2), expected) {
        return "PASSED".to_string();
      };
      return "FAILED".to_string();
  
  }
  
  fn main() {
      println!("TEST-0...{}", driver(
        236.27324548309292, 5792.493225762838, 7177.837879115863, 1289.5700425822731, 
        -0.6486899453998202
      ));
      
      println!("TEST-1...{}", driver(
        -9201.144918204123, -2716.3347716140406, -5161.142121227645, -3205.784279961129, 
        -0.12115078452752318
      ));
      
      println!("TEST-2...{}", driver(
        3480.4716834445326, 3577.9608612055613, 8611.515262945342, 6744.864707668983, 
        0.617204628531244
      ));
      
      println!("TEST-3...{}", driver(
        -6915.538971485092, -4113.601103381095, -748.3462104020822, -9245.271700539257, 
        -0.8320918116165706
      ));
      
      println!("TEST-4...{}", driver(
        8887.97173657486, 1678.4080012662428, 8709.574949883017, 8548.492675510739, 
        -38.51013687881985
      ));
      
      println!("TEST-5...{}", driver(
        -3785.5177159369946, -3084.67461899163, -7415.76208254121, -887.5389305564152, 
        -0.6052307962095809
      ));
      
      println!("TEST-6...{}", driver(
        3037.6696554256832, 4432.445827549, 8387.304165588026, 611.3373507518394, 
        -0.7142746798007333
      ));
      
      println!("TEST-7...{}", driver(
        -7925.458496016523, -3350.27411882042, -5619.767086756504, -1185.7423219907591, 
        0.9387777514963889
      ));
      
      println!("TEST-8...{}", driver(
        1404.2919985268031, 8971.636233373416, 3039.112051378511, 1947.6756252708972, 
        -4.2964732392719505
      ));
      
      println!("TEST-9...{}", driver(
        -4748.744241168378, -675.557388148954, -5998.241086029875, -4236.658178504375, 
        2.85002783720527
      ));
      
  }
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 );
  }