The equation that represent a proportional relationship is:
[tex]y=kx[/tex]
If cruise ship move 49.5 feet for every gallon that mean:
[tex]\begin{gathered} y=kx \\ y=49.5x \end{gathered}[/tex]
Where y define a distance that cruise ships move and x fuel in gallon 49.5
is a proportionality constant.
Previousaly it moved 36 feet per gallon that mean:
[tex]\begin{gathered} y=kx \\ y=36x \end{gathered}[/tex]
Proportionality is 36 is define as value of y in unit value of x.
