Answer:
El Dr. Potter aplicó 32 vacunas de polio y 28 de sarampión.
Step-by-step explanation: 
- First, the data must be taken into account to create the equations: 
- Where: 
 X = Number of polio vaccines and Y = Number of measles vaccines. 
-  4X + 2Y = 184; (Equation 2) 
 
Where for each polio vaccine there are 4 doses and for each measles vaccine there are 2 doses. 
- We clear the variable that we want to find in each equation: 
- Y = 60 - X; (And we call it equation 3) 
 
- Y = (184-4X) / 2; (And we call it equation 4) 
 
- Now both equations are equalized in terms of the same variable: 
- Then X is cleared to find its value: 
- Now we demonstrate the value of X obtained in equation 1 or 2 to give the values of Y 
- Finally, both values are used to see if equation 2 gives us the correct data: 
- The answer is given: 
Dr. Potter gave 32 polio and 28 measles vaccines.