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amberr813
amberr813 amberr813
  • 17-03-2015
  • Mathematics
Answered

Variable y varies directly with variable x, and y = 6 when x = 9.


What is the value of x when y = 18?

Verified Answer :

Hippalectryon
Hippalectryon Hippalectryon
  • 17-03-2015

x and y are proportional hence when y is multiplied by a number, x is multiplied by the same number.

18=63 hence when y=18,x=93=27

x=27

Answer Link
baonguyenq1999
baonguyenq1999 baonguyenq1999
  • 17-03-2015

so you can set up a proportion like
x/y=x/y
9/6=x/18
simplify 9/6=3/2
3/2=x/18
multiply both side by 18
(3x18)/2=x
54/2=x
x=27

Answer Link

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