Write a formula for the cost of *x* oranges if *y* oranges cost *d* dollars.

If *y* oranges cost *d* dollars, then one orange costs *d*/*y* dollars. Thus *x* oranges cost *xd*/*y* dollars.

Write a formula for the cost of *x* oranges if *y* oranges cost *d* dollars.

*y* oranges cost *d* dollars, then one orange costs *d*/*y* dollars. Thus *x* oranges cost *xd*/*y* dollars.