### Home > PC > Chapter 7 > Lesson 7.3.3 > Problem7-123

7-123.

$y$ varies directly as the square root of $x$ and $y = 11$ when $x = 4$.

1. Express $y$ as a function of $x$.

Don't forget the '$k$'.
Substitute the point and solve for '$k$' to get the function.

2. Find $f\left(0\right)$, $f\left(4\right)$, $f\left(8\right)$, and $f\left(a^{2}\right)$.