The total cost of one milk is $0.50,
Let 'y' represents the cost of one milk,
Let 'x' represents the cost of turkey sandwiches,
5 turkey sandwiches will be 5 × x= 5x
4 milks will be 4 × y= 4y
4 turkey sandwiches will be 4 × x = 4x
8 milks will be 8 × y = 8y
Let us now get the equation to solve for the cost of turkey sandwich,
[tex]\begin{gathered} 5x+4y=4x+8y \\ \text{collect like terms,} \\ 5x-4x=8y-4y \\ x=4y \\ \text{Therefore, the equation used to solve for the cost of a turkey sandwich} \\ is, \\ x=4y \\ \text{where x is the cost of one turkey sandwich} \\ y\text{ is the cost one of one milk} \end{gathered}[/tex]Hence, the equation is x = 4y.
Let us now solve for the cost of a turkey sandwich,
[tex]\begin{gathered} \text{Given,} \\ x=4y \\ \text{where y= \$0.50} \end{gathered}[/tex][tex]\begin{gathered} x=4\times\text{ \$0.50} \\ x=\text{ \$2} \end{gathered}[/tex]Hence, the cost of a turkey sandwich is $2.
