What is the equation of the function that is graphed as line a ?

1. y = - x + 1
2. y = 3 x - 1
3. y = 3 x + 1
4. y = x - 1

What is the equation of the function that is graphed as line a 1 y x 1 2 y 3 x 1 3 y 3 x 1 4 y x 1 class=