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timofeeve [1]
3 years ago
15

If x varies inversely as y, and x = 7 when y=3, find y when x = 9.

Mathematics
2 answers:
RSB [31]3 years ago
5 0

Step-by-step explanation:

x=k/y------(1)

k=xy

k= 7×3

k=21

from equation 1

x=k/y

y=k/x

y=21/9

y = 2.33

Liono4ka [1.6K]3 years ago
5 0

Answer:

3.85714285714

Step-by-step explanation:

7 = 3

9 = y

9*3=27

27/7 = 3.85714285714

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Question: "If y > 3, what is the value of n ?"
iris [78.8K]

Answer:

y-3

Problem:

What is the remainder when the dividend is xy-3, the divisor is y, and the quotient is x-1. ?

Step-by-step explanation:

Dividend=quotient×divisor+remainder

So we have

xy-3=(x-1)×(y)+remainder

xy-3=(xy-y)+remainder *distributive property

Now we just need to figure out what polynomial goes in for the remainder so this will be a true identity.

We need to get rid of minus y so we need plus y in the remainder.

We also need minus 3 in the remainder.

So the remainder is y-3.

Let's try it out:

xy-3=(xy-y)+remainder

xy-3=(xy-y)+(y-3)

xy-3=xy-3 is what we wanted so we are done here.

7 0
2 years ago
7.5g of sugar is needed for every cake made how much sugar is needed for 10 cakes
lana [24]

Answer:

75 g

Step-by-step explanation:

i think as this a recipe propotional so you have to find how much sugar is needed for 1.g


4 0
3 years ago
Can anyone help with this math problem?
Ne4ueva [31]
The answer is 8. You rewrite the fraction as 5.25.
6 0
2 years ago
Read 2 more answers
Help on number nine please?​
AURORKA [14]

im pretty sure true because they do not intersect and are not parallel :)

7 0
3 years ago
Find the inverse function of f informally. f(x) = 6x
yaroslaw [1]
f^-^1(x) =  \frac{x}{6}
8 0
3 years ago
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