Question

Suppose y varies directly as x, and y=20 when x=2. Which of the following is the correct equation to set up to solve for the constant of variation?

k=2+20
2/20=1/k
2=k(20)
20=k(2)

Answer 1

So y is directly proportional to x

y∝x
Removing proportionality and putting constant we get
y=kx
k=constant
We knw that when y=20 x=2
So
20=2(k)

Answer 2

I agree @imqwerty

Answer 3

thnx.

Answer 4

No prblm :D