Each polio consists of 4 doses and rack measles vaccination consists of 2 doses. last year potter gave out a total of 60 vaccinations and that consisted of a total 128 doses

Step-by-step explanation:

x = polio

y = measles

x + y = 60x = 60 - y

4x + 2y = 128

4(60 - y) + 2y = 128

240 - 4y + 2y = 128

-4y + 2y = 128 - 240

-2y = -112

y = -112 / -2

y = 56 < there were 56 doses of measles  vac. given

x + y = 60

x + 56 = 60

x = 60 - 56

x = 4 <=== there were 4 doses of polio vac. given

how is that middle school

step-by-step explanation: