Question

The variable Z is inversely proportional to X. When X is 3, Z has the value 6.3333333333333. What is the value of Z when X = 8 Round to at least the thousandths place if needed.

Answer 1

Inverse variation is of the form y=k/x or if you prefer yx=k.

z=6.3 bar I assume you mean 6.33333333 forever

10z-z=63.3333...-6.3333

9z=57

z=57/9 (exact)

Now back to the problem...

xz=k, we are told x=3 and we have shown z=57/9 so we can solve for k, the constant of variation

k=3(57/9)=19

So our equation is:

xz=19, now we wish to know what z is when x=8 so

8z=19 divide both sides by 8

z=19/8

z=2.375 (exact, no rounding necessary)