Question

find f(6) when f={(5,-7),(6,6),(-1,7)}

Answer 1

when you are asked to find f(a) (where a is a number) you are basically being asked to find the y value of the graph f(x) where the x value of the coordinate is a. so in the question above, we are asked to find f(6) where f = {(5, -7), (6, 6), (-1, 7)}
so if we plotted that graph we should get something like this