F(n)=235-(235*.3^n)+50n is your equation where * is multiplication and ^ it to the power to.
If y = 6 when x = 8, then value of "x" when y = 9 is equal to 12
<u>Solution:</u>
Given that , In a certain function, y varies directly with x
And x = 8 when y = 6,
We have to find what will be the value of x when y = 9
Now, from the given information,

where c is the proportionality constant

Hence, x value is 12 when y value is 9

I only know this because I remember the common fractions, and 1/3 is .3333 repeating.