Question

If x varies directly with y and x = 2.5 when y = 10, find x when y = 16.

Answer 1

Since 2.5 is a quarter of 10, u have to find a quarter of 16 which is 4. So X=4

Answer 2

x = 4

Explanation:

If x varies directly with y

Directly Proportional:

`y\proto x`

`y=kx`

where, k is constant of proportionality

x = 2.5 when y = 10

`10=k\cdot 2.5`

`k=4`

Equation:

y=4x

Put y=16 and solve for x

`16=4x`

`x=4`

Hence, The value of x is 4 at y=16