So than y varies directly with x this mean y = x

so than y=400 when x=r andy = r when x = 4

y=400 x=r

y =r x=4

bc. we know that y varies directly as x so y=nx so r= 4/400 = 1/100

the numeric constant is r = 1/100

so than y=400 when x=r andy = r when x = 4

y=400 x=r

y =r x=4

bc. we know that y varies directly as x so y=nx so r= 4/400 = 1/100

the numeric constant is r = 1/100

y = 10*x

Step-by-step explanation:

y = kr --> 400

r = 4k

400 = k (4k) = 4k^2

k^2 = 400/4 = 100

k = sqrt(100) = 10

k = 10

Step-by-step explanation:

y = kx

400 = kr . . . . . . (1)

also, r = 4k . . . .(2)

400 = k(4k) = 4k^2

k^2 = 400/4 = 100

k = sqrt(100) = 10

10

Step-by-step explanation:

If there is a direct relation between two variables x and y then it can be represented as

y = kx ,

where y is dependent variable

x is independent variable

k is constant of variation

_____________________________

First condition

y = 400

x = r

using y = kx then relationship will be

400 = kr

finding k here

k = 400/r

Second condition

y = r

x = 4

using y = kx then relationship will be

r = 4k

finding k

k = r/4

since in both condition equation is same

thus, value of k will also be same

thus,

400/r = r/4

=> 400*4 = r*r

=> 1600 = r^2

Thus, 40 is the value of r

k = r/4 = 40/4 = 10

Thus, constant of variation is 10 which is correct choice.

To cross validate

k = 400/r = 400/40 = 10

I graphed both functions and the answer should be the following:Number of points of intersection = 1x - coordinate of the solution = 0y - coordinate of the solution = (-2)hope this...Read More

3 more answers

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there...Read More

1 more answers

Step-by-step explanation:hi so i cant read ur question but i would love to help you...Read More

1 more answers

but which class are u may know that first...Read More

1 more answers

answer: $201step-by-step explanation: to get the answer, you first get 3 nieces that he sold and multiply it by 67 and get $201, so he earned $201 selling his nieces....Read More

1 more answers

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 mi...Read More

1 more answers

20 percentage, you can also do it on a calculator....Read More

1 more answers

- An apple farm is taking stock of its inventory for the season. each ye...
- The scatter plot shows the ages snd heights of 15 students in a physic...
- What is 100 divided by 49 simlified?...
- What is the answer; if a=b 30 and c=b 60?...
- Divide. (-6m^7 + 20m^6) ÷ 2m^4 a. -6m^7 + 20m^2 b. -3m^3 + 10m^2 c....
- Alocal grocer cut his marketing budget by 57% last year. he spent only...
- Abox of 24 greeting cards is sold at a gift shop for $3.00. the cost t...
- Aconstruction worker needs to put a rectangular window in the side of...
- When emma was born, she weighed 3.2 kilograms. in 2 months, she weighe...
- Round 1714.92 to the nearest hundredth...