Question

For the equation -4y=8x what is the constant or variations?
A.-4
B.-2
C.1
D.2

Answer 1

I think it's A am I correct?

Answer 2

Yea its A

Answer 3

yea

Answer 4

Can you help with 3 more?

Answer 5

solve for y

Answer 6

equation for direct variation is `y=kx`
equation for inverse variation is `y=k/x` where k is constant of variation

Answer 7

suppose y varies directly with x, and y=24 when x=8 what is the value of y when x=10?
A.10
B.30
C.80
D.240
(I think C am I correct?) @Nnesha @ransondyara471 @yeval76

Answer 8

what did you get for first one ?

Answer 9

nd no
direct variation y =kx plugin x =8 y=24 and then solve for k(constant of variation )

Answer 10

@Nnesha can you teach/show me how to get the answer ik you already did but I still don't understand how to solve to get the answer can you do it in steps please

Answer 11

for first one can you solve for y ?

Answer 12

how would you cancel out -4 from left side \[\large\rm -4y=8x\]?

Answer 13

no we don't need to add

Answer 14

it's -4 times y
so to cancel out -4 do opposite of multiplication

Answer 15

opposite of multiplication is ??

Answer 16

division

Answer 17

right divide both sides by -4

Answer 18

-4/-4=1
8/-4=-2

Answer 19

correct!

Answer 20

so for the first one the correct answer is -2? and not -4?....

Answer 21

@Nnesha

Answer 22

yes

Answer 23

can you help me with the second one @Nnesha

Answer 24

what's the equation for `direct variation` ?

Answer 25

y=kx??

Answer 26

correct replace x and y for their values then solve for k

Answer 27

`y=24 when x=8 `
y=kx

Answer 28

so i'd divide 24 by??? k, but what is k. how do I find it? @Nnesha

Answer 29

first replace y with 24 and x with 8
to solve for k would you move 8 to the left side or 24 to the right side ?

Answer 30

8 to the right?
24/8=3
24/24=1

Answer 31

wayes 3 is the constant of variation

Answer 32

what do you mean by 24/24

Answer 33

\[\rm 24=8k\] divide both side by 8
you get k=3
now substitute k for 3 and x for 10 solve for y

Answer 34

I'm confuse. So itll be B. 30 for the answer

Answer 35

yes correct \[\rm y=kx\] k=3 so when x=10 y=?
we should replace x with 10 and k with 3 then multiply

Answer 36

thank you. I had no idea how to solve problems like these I somewhat just learned how to do it a little. I'm not a pro but I some what know a little bit of what to do

Answer 37

yeah practice will help you to learn it:=))