Explanation:
Given that,
A meal plan lets students buy $20 meal cards.
Each meal card lasts about 8 days.
Let us assume that y denotes number of days for a 20 dollar meal card i.e. $20 every 8 days.
Let x = number of $ for another day.
So,
![y=(8)/(20)x+8](https://img.qammunity.org/2022/formulas/mathematics/college/6ekhq16xjvihzt01gci92iibnlm4pr813u.png)
![y=(2)/(5)x+8](https://img.qammunity.org/2022/formulas/mathematics/college/m7uqw3c5mt8h1ajyawnr4jbzwgkka79td5.png)
Hence, this is the required equation.