f. \( y=7-x \)

Ah, the equation \( y = 7 - x \) describes a straight line! This line has a y-intercept at (0, 7) and a slope of -1, meaning for every unit you move to the right along the x-axis, you drop one unit on the y-axis. You can visualize it as a fun game of connecting dots, helping you understand linear relationships in algebra. This equation can be applied in various real-world scenarios, such as determining how much fuel you have left after using a certain amount or calculating costs. For instance, if you start with $7 and spend $x, the equation helps you see how much money you have left! It’s like budgeting but with numbers that make a straight line!