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PNA
06.10.2019 •
Mathematics
8. complete the statement.
zgdf ?
a. zedf
b. zdef
c. zdgf
d. zdfe
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Ответ:
m = number of morning practices
a = number of afternoon practices
m + a = 10 (there are 10 practices total, either morning or afternoon)
5m + 6a = 57 (each morning practice is 5 hours, afternoon ones are 6. multiply by the number of each and you would get the total number of hours ran, 57)
Let's solve using substitution.
m + a = 10
m = 10 - a
Substitute 10 - a for m.
5(10 - a) + 6a = 57
50 - 5a + 6a = 57
50 + a =57
a = 7
Use a = 7 in an earlier equation to find m.
m + a = 10
m + 7 = 10
m = 3
There were 3 morning practices and 7 afternoon practices.