The table shows Cassie's age and Heather's age over 3 consecutive years. 

Cassie's age, x (years)      Heather's age, y (years)
        12                             15
        13                             16  
        14                             17
        15                             18                                       

Which expresion can be used to represent Heather's age in terms of Cassie's age?


Since Heather's age is in every case 3 more than Cassie's age,

  Heather's age = Cassie's age + 3
         |             |       | |
         y      =      x       + 3

      So it's y = x + 3.

Edwin
     

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