The equation y = kx represents a proportional
relationship between x and y, where k is the
constant of proportionality. For a moving object,
the equation d = st represents a proportional
relationship between distance (d) and speed (s)
or between distance (d) and time (t). Explain the
different ways that you can define the constant of
proportionality for this equation. Then describe
some other equations that represent proportional
relationships in the real world and explain why
they're useful. Research on the Internet, if
needed