elizabethprasad2
01.11.2019 •
Mathematics
Suppose y varies directly as x and y equals 21 when x = 3 find x when y = 42
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Ответ:
21 = k*3
k = 7
Equation:
y = 7x
Find x when y = 42
42 = 7x
x = 42/7
x = 6
x = 6 when y = 42
Ответ:
y = cx where c = constant of proportionality
cx = y
c = y/x
y = 21, x = 3, y = 42, x = ?
y/x = c
21/3 = 42/x
7 = 42/x
x = 42/7
x = 6
so x = 6
Hope this explains it.
Ответ:
At 15 hours the charge would be the same
the charge is going to be $337
hope this helped :)
Step-by-step explanation: