Explain why z2 = x + 3y is not a function of x and y.

Let f = {(- 2,1),(1,- 1)} and g = {(-2,- 4),(3,0).(5,6)}. Find f+g and its domain.

Determine whether the equation or table defines y as a function of x y + 1/y = x + 1/x

Tom is driving to Seattle. Suppose that the distance to his destination (in miles) is a linear function of his total driving time (in minutes). Tom has 54 miles to his destination after 49 minutes of driving, and he has 33.2 miles to his destination after 75 minutes of driving. How many miles will he have to his destination after 91 minutes of driving?