Question

Zach and his friends had a movie marathon on Saturday. Every movie they watched was 2 hours long. Seven hours into their movie marathon, Zach and his friends had watched 3 1/2 movies. Write an equation in standard form that expresses the number of movies they watched, y, as a function of the number of hours they spent watching movies, x.

Answer 1

y is the number of movies
x is the number of hours
It takes 2 hours per movie
Thus:

y = x/2
2y = x
x - 2y = 0

The answer is C