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brookephillips9111
06.05.2020 •
Mathematics
Sistemas de ecuaciones
Prueba de unidad
Puede que necesites: 3 Calculadora
El Dr. Potter aplica vacunas contra la polio y el sarampión.
Cada vacuna de polio consiste de 4 dosis y cada vacuna de sarampión consiste de 2 dosis. El año pasado, el
Dr. Potter aplicó un total de 60 vacunas que consistieron de un total de 184 dosis
¿Cuántas vacunas de polio y cuántas vacunas de sarampión aplicó el Dr. Potter el año pasado?
El Dr. Potter aplicó
vacunas de polio y
vacunas de sarampión.
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Ответ:
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:
X + Y = 60; (Equation 1)- 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:
60 - X = (184 - 4X) / 2- Then X is cleared to find its value:
120 - 2X = 184 - 4X 4X - 2X = 184 - 120 2X = 64 X = 32- Now we demonstrate the value of X obtained in equation 1 or 2 to give the values of Y
(32) + Y = 60 Y = 60 - 32 Y = 28- Finally, both values are used to see if equation 2 gives us the correct data:
4 (32) + 2 (28) = 184 128 + 56 = 184- The answer is given:
Dr. Potter gave 32 polio and 28 measles vaccines.
Ответ:
x-4 = 13
x = 17