Katie is 44 years younger than Sylvia. ​Let kk represent Katie's age, ​and let ss represent Sylvia's age.​ ​ ​Part A Using the variables defined above, write an equation that ​shows the relationship between Katie's age and Sylvia's age. ​ ​ ​Part B Use the equation from Part A to find how old Sylvia is when ​Katie is 13 years old. ​ ​​ years old.