Question

If x and 2y vary directly
and x= 8 when y = 2
find x when y= 10​

Answer 1

Step-by-step explanation:

This is an example of inverse proportion, or inverse variation.

To change a proportion into an equation, multiply by a constant and then use the values given to find the value of the constant.

y*1/x

y=x/k

⇒k=y/x

k=8x10

=80

So,

y=80/x

When

x=6,

y=6/80