Question

y varies inversely with x and y = 5 when x = 2.



Which is the inverse variation equation for the relationship?
A.y=2x
B.y=1/2x
C.y=10/x
D.y=x+2

Answer 1

Last time I annoy you I promise! @ranga

Answer 2

"y varies inversely with x" means:
y = k * 1/x
when x =2, y = 5. Put the numbers above and solve for k.

Answer 3

5=k*0.2?

Answer 4

x is 2 not 0.2

Answer 5

oh sorry. whoops

Answer 6

5=k*2?

Answer 7

in other words y=2x? which would b a?

Answer 8

No. This is inverse variation. So y = k * 1 / x

Answer 9

Then it might be B.?

Answer 10

Put x = 2, y = 5 in y = k * 1 / x
5 = k * 1 / 2 = k/2
multiply both sides by 2
2*5 = k
k = 10
So y = 10 / x

Answer 11

oh ok I get it now thanks again your a lifesaver!!!! :))))

Answer 12

you are welcome.