Final answer:
To write an equation for a graph where y depends on x, you can use the formula y = mx, where m is the constant of proportionality that determines how much y changes for every 1 unit increase in x. By plugging in different values of x into this equation, you can find the corresponding values of y and plot them on a graph.
Step-by-step explanation:
When y depends on x, we can write an equation to represent this relationship. The equation will have y as a function of x. For example, let's say that y increases by 2 for every 1 increase in x. We can write the equation as y = 2x. This equation shows that y depends on x, with the constant of proportionality being 2. By plugging in different values of x into this equation, we can find the corresponding values of y and plot them on a graph.