$$y={\sqrt4{x}}$$ - 

$${\sqrt4}$$

$$y={3x\over4}$$ - 

$$3\over4$$

$$y={\sqrt3{x}}$$ - 

$${\sqrt3}$$

$$y={x\over4}$$ - 

$$1\over4$$

$$y={5x\over6}$$ - 

$$5\over6$$

$$a=5{b}^2$$ - 

5

$$a=2{b}^3$$ - 

2

$$a=3{\sqrt[3]{b}}$$ - 

3

$$a=\sqrt{3}{\sqrt{b}}$$ - 

$$\sqrt{3}$$

$$a\propto{b}$$ - 

$$a$$ is directly proportional to $$b$$

$$a\propto{b}^3$$ - 

$$a$$ is directly proportional to $${b}^3$$

$$a\propto{\sqrt[3]{b}}$$ - 

$$a$$ is directly proportional to $${\sqrt[3]{b}}$$

$$a\propto{\sqrt{b}}$$ - 

$$a$$ is directly proportional to $${\sqrt{b}}$$

$$a\propto{b}^2$$ - 

$$a$$ is directly proportional to $${b}^2$$