#### Section 4-Ratio, proportion and rates of change

What is the equation for y is proportional to x

y=kx

What is the equation for y is inversely proportional to x

y=k/x

What is the equation for y is proportional to the square of x

y=kx²

What is the equation for t is proportional to the √ of h

t=k√h

What is the equation for V is inversely proportional to r cubed

V=k/r³