Given data:
The expression for dog eats 3 cans of dog food in 12 days is,
[tex]\begin{gathered} 3y=12x \\ y=4x \end{gathered}[/tex]The expression for 30,000 plastic bottles in 4 trucks is,
[tex]\begin{gathered} 4x=30,000y \\ x=7,500y \end{gathered}[/tex]The expression for 1 dinghies carries 1300 pound is.
[tex]y=1300x[/tex]