Creating and Graphing Two Variable Equations Practice Test

A rectangle has length $x$ feet and width $(x-4)$ feet. Let $A$ be the area (in square feet). What equation represents the relationship between $A$ and $x$?

A bike rental shop charges $12 to rent a bike plus $4 per hour. Let $h$ be the number of hours and $T$ be the total cost in dollars. Which equation models the relationship between $h$ and $T$?