1. determine whether the equation defines y as a function of x. y= I x I A- function B- not a function 2. Let f = { ( - 2, 4 ), ( - 1, 3 ), ( 0, - 1 ), ( 1, - 2 ), ( 2, - 4 ) }. Find f ( - 1 ). 3. Which of the following defines y as a linear function of x? A) y= 1/4x - 3/4 B) y=x^2 C) y= 1/x D) y = _/x (square root)