, 26.12.2019egreer9287

# If y varies directly as x and y is 400 when x is r and y is r when x is 4 what is the numeric constant of variation in this relation

## Answers queenjanet46
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 khehnai

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 sarah192002

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 antcobra

Step-by-step explanation:

Bsisbsiswbwj joshuasanders7490

EDGE 2020

Step-by-step explanation:

A) 10

trust me mahagonylabeyta

A. 10   on Edg2020

Step-by-step explanation:

Hope this helps     : ) daniel4349

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 jkortis15

y is 100 times what x is. angie7665   Shyshy876

options ?

Step-by-step explanation:

Do you know the answer?  ### Other questions on the subject: Mathematics Mathematics, 21.06.2019, emj617
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 Mathematics, 21.06.2019, william03300
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 Mathematics, 21.06.2019, Ap621765
Step-by-step explanation:hi so i cant read ur question but i would love to help you...Read More
1 more answers Mathematics, 21.06.2019, zsmart909
but which class are u may know that first...Read More
1 more answers Mathematics, 21.06.2019, lilybrok04
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 Mathematics, 21.06.2019, LilFabeOMM5889
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 Mathematics, 21.06.2019, asseatingbandit
20 percentage, you can also do it on a calculator....Read More
1 more answers Mathematics, 21.06.2019, izzynikkie
cStep-by-step explanation:                    ...Read More
2 more answers