Hey sis! Can you help me? Its about direct variations.
Yeah sure! Let's go there.
If x varies directly as y, and x = 9 when y = 6, find x when y = 15 is the example
(1) Remember to write the right equation and that direct variations are solved using the equation, y = kx
(2) You use the information given in the problem to find the value of k. In this case, you need to find k when x = 9 and y = 6.
what's the next step?
Rewrite the equation from step 1 substituting in the value of k found in step 2.
Use the equation found in step 2 and the remaining information given in the problem to answer the question asked. In this case, you need to find x when y = 15.
Then what's next?
That's it!
Really? OMG! I get it now. Thank you so much sis!
You're welcome.
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