niescarlosj
28.06.2019 •
Mathematics
Given: y varies directly as x. if y = 5 when x = 4, what is the value of y when x = 12? a) 9.6 b) 10 c) 12 d) 15
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Ответ:
D) 15
Step-by-step explanation:
We know the formula for direct variation is
y=kx
Substituting y=5 and x=4 we can calculate k
5=k4
Divide each side by 4
5/4 =k
Now y= 5/4 x
If x =12
y =5/4*12
y = 15
Ответ:
hope this helps