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Volgvan
3 years ago
9

If y varies directly as​ x, and y=8 when x=3​, find y when x=15.

Mathematics
1 answer:
Crank3 years ago
8 0

Answer:

y=40

Step-by-step explanation:

The formula for Direct Variation is y=kx or k=y/x. In this case I would use k=y/x. If you're y is 8 and x is 3, this means that K=8/3. Using this, we know that X=15. We have to find a Y value so that the fraction with an x of 15 simplified is 8/3. To do this you would write 8/3 and y/15. Now cross multiply to get 3y=120. Divide by 3 to get y=40. View my attachment for the work!

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The absolute decrease is


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Problem 2:


Mary has a monthly salary of $1200. She spends $280 per month on food. What percent of her monthly salary does she spend on food?


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