Question

If y is 2.5 when x is 5 and y varies directly with x, find y when x is 10.

Answer 1

Y=2.5 when X=5
Y=5 when X=10

Basically 10÷5=2 so 2.5×2=5

Answer 2

The value of y is 5.

Explanation:

We have been given that y varies directly with x. Thus, we have

`y=kx`

Now, y is 2.5 when x is 5. Thus, we have

`2.5=k(5)`

Divide both sides by 5, we get

`k=0.5`

Now, we have to find y when x is 10.

`y=0.5*10\\\\y=5`

Therefore, the value of y is 5.