Represent a given function as an arrow diagram, a table and a graph.

1. 1 · Write what is given and what is to be found. Copy f. Note the domain (first entries) and the images (second entries).
2. 2 · Write the formula or theorem. f is a function when every element of the domain has exactly one image.
3. 3 · Draw the arrow diagram. Two labelled ovals, A and B, with one arrow from each x to f(x).
4. 4 · Make the table. Two rows: x in the top row and f(x) under each x.
5. 5 · Draw the graph.
   • Draw and label both axes; write the scale.
   • Plot each pair (x, f(x)) as a dot.
   • Do not join the dots when the domain is a finite set.
6. 6 · Check and box the answer. Count the arrows, table columns and dots: each count must equal the number of pairs.

Scoring tip: Use a sharp pencil and write the scale, for example 'x-axis: 1 cm = 1 unit, y-axis: 1 cm = 1 unit', in the top corner of the graph.