kaoris6368
23.07.2019 •
Mathematics
14. anna burned 15 calories per minute running for x minutes and 10 calories per minute hiking for y minutes. she spent a total of 60 minutes running and hiking and burned 700 calories. the system of equations shown below can be used to determine how much time anna spent on each exercise. 15x + 10y = 700 x + y = 60 how many minutes, x, has anna spent running?
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Ответ:
i am going to use x + y = 60 to rearrange
x + y = 60
y = 60 - x
you then substitute 60 - x into the y value
15x + 10y = 700
15x + 10(60 - x) = 700
then you solve for x
15x + 600 - 10x = 700
15x - 10x = 700 - 600
5x = 100
x = 20
then, to solve for y, if needed
you would use the x variable to find it
x + y = 60
20 + y = 60
y = 60 - 20
y = 40
Ответ:
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