Question

X various inversely as y ,when X = 15 then Y = 10... if x = 20 then y = ?

Answer 1

,..........,.......................

Answer 2

We need to find an equation to model this relationship.

The formula for an inverse relationship is :

XY = k

Where k is a constant.

Y = 10

X = 15

k = 15 × 10 = 150

Now :

X = 20

Y =?

Since :

k = XY

X = 20

150 = 20Y

Y = 150/20 = 7.5

= 7.5