SOLUTION: If x and y vary directly, and x=10 when y=3, what will be the value of x when y=9??

Question 1091802: If x and y vary directly, and x=10 when y=3, what will be the value of x when y=9??
Found 2 solutions by Edwin McCravy, MathLover1:
Answer by Edwin McCravy(20060) (Show Source): You can put this solution on YOUR website!

If x and y vary directly,

and x=10 when y=3,

Substituting for k in

what will be the value of x when y=9??

Substitute 9 for y in Edwin

Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

If and vary , we have

and if when ,we can use it to find

so, equation is:
the the value of when is:

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