The ordered pairs in the sets shown below are of the form (x,y). In which set is y a function of x?
Which of the following graphs appears to be a function?

What is g(2) for
Which graph best represents the equation

The number of miles, m, a car can travel varies directly with the amount of gas, g, in its fuel tank. If k is the constant of variation which equation represents the situation?
The depth of a lake, d, varies directly with r, the amount of rainfall last month. If k is the constant of variation, which equation represents the situation?
What value of x makes this equation true?
What is the slope of the line x=4