2. d A function maps each x value to at most one y value
3. 3 left and 4 down is addition of (-3, -4) so A(5,1), B(4,5) and C(2,3) map to A'(2,-3), B'(1,1), C'(-1,-1)
Answer: d
4. Slope of 1, y intercept -5
Answer: c
5. b That's a reflection in the y axis