Question

Help with three math problems!

Answer 1

help me @shamil98

Answer 2

determine the value of k first for the direct variation.
k = y/x

Answer 3

y = kx
so after you determine k , input the values and evaluate.

Answer 4

Can u plug in the numbers? this is confusing

Answer 5

Shamil has shared with you the correct form of the equation for direct variation.
y=kx.

Now please substitute x=-6 and y=-3 into that equation. Solve the result for k.

Answer 6

ok let me solve it and then will u verify my answer?

Answer 7

Sure, if you act fast!

Answer 8

So i have =3=-6(x) what do i do from here?

Answer 9

-3 divided by -6?

Answer 10

Solve the result for k (not x). Please try this yourself.

Answer 11

-0.5?

Answer 12

2y-6=8x+4

2y=8x+10

y=4x+5

y'=4

Answer 13

luba: why (-)?

Answer 14

oh ur right not negative

Answer 15

so just 0.5?

Answer 16

what would be the constant of variation?

Answer 17

So, luba, k=.5. yes.
Now take that same equation again: y=kx.
Substitute k=0.5.
What will the equation now look like?

Answer 18

-3=6(.5)

Answer 19

oh the 6 is negative

Answer 20

so -3=-6(0.5)

Answer 21

correct?

Answer 22

do u mind telling me the constant of variation?

Answer 23

Take your time; accuracy is more important than speed.
Is that equation of yours correct or not? You can judge that yourself.

Answer 24

You have already found the constant of variation; it is k=0.5

Answer 25

oh alright! plz is my equation correct

Answer 26

Is -3=-6(0.5) true or false?

Answer 27

true

Answer 28

Yes; you didn't need to ask me whether it was correct or not; you know how to decide that for yourself.

Answer 29

Now you know k. Substitute your k value into y = kx to obtain a general relationship between y and x.