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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

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Answer:

Step-by-step explanation:

x = polio

y = measles

x + y = 60....x = 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

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