Question

If y varies directly as x, and y is 18 when x is 5, which expression can be used to find the value of when x is 11?

Answer 1

Answer:

 $\frac{18}{5}$ (11)

Step-by-step explanation:

If it varies directly, you need to find k, the constant of proportionality.

This is done by plugging the values in for x & y that are known.

y = kx

18 = k(5)

$\frac{18}{5}$ = k

Now solve for y  when x is 11.

y = $\frac{18}{5}$ (11)

y = 39.6