If y varies directly with x, write an equation for the direct variation. Find y when x=15 if y=16 when x=30.

Question

If y varies directly with x, write an equation for the direct variation.  Find y when x=15 if y=16 when x=30.

mathmale · Answer

As a general rule, "direct variation" is represented by the formula y=kx, where k is called the "constant of proportionality."

y = kx

You are given y=16 when x=30.  Please find the value of k.

Now re-write the formula y = kx, using the value of k you've just found.

Finally, let x=15 and find y.

pawanyadav · Answer

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vocaloid · Answer

still there?