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math - find y when x=12











































Assuming that y is directly proportional to x:

if y=7 when x=4, find y when x=12

Comments for math - find y when x=12

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Oct 27, 2012
find y
by: Staff


Answer


You forgot to include the equation, or an explanation about the relationship between x and y.

You are welcome to include that information as a comment.

Assuming that y is directly proportional to x:
:


y(x) = kx

      If y = 7 when x = 4

      y(4) = k*(4) = 7

      k*(4) / 4= 7 / 4

      k * (4 / 4)= 7 / 4

      k * (1)= 7 / 4

      k = 7 / 4

      y(x) = (7/4)*x

what is the value of y when x = 12

      y(12) = (7/4)*12

      y(12) = 21

When x = 12, y = 21



Final Answer, assuming that y is directly proportional to x :

When x = 12, y = 21





Thanks for writing.

Staff
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