16shuston
  • 16shuston
Will medal and fan. If x varies directly as y, and x=42 when y=7, find x when y=3
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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16shuston
  • 16shuston
all i need is the set up
Nnesha
  • Nnesha
equation for direct variation \[\huge\rm y=kx\] where k is constant of variation.
Nnesha
  • Nnesha
substitute x and y for their values solve for k

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anonymous
  • anonymous
Ok so you are going to do this: 42/7 = x/3 Now cross multiply 42*3 = 7x Solve for x
16shuston
  • 16shuston
okay that makes sense. thank you
anonymous
  • anonymous
126 = 7x x = 18 Medal? Please

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