Directly Proportional Variation Word Problem Solver: Example

See Other Variation Word Problem Examples solved by the Algebra Word Problem Solver.

What You Enter

y varies directly proportional to x. y=3 when x=25. Find y when x= 7.

What You Get

 Y = kX    Direct Variation Statement
 
 3 = k * 25            //  Y = 3 WHEN X = 25 . Substitute values.
 
      3                                        
 k =  ----      //  Constant of Proportionality
       25                                      
 
      3                                       
 k =  ---      //  Constant of Proportionality
       25                                     
 
      3                                    
 Y =  ----X        //  Y as a Function of  
       25                                  
 
 Y = (3 / 25 ) 7        //  X = 7 . Substitute value.
 
 Y = (21 / 25 )       //  Y WHEN X = 7

Solution: Y = (21 / 25 )