Make a table; choose some values for x and find the corresponding values for y.
\| \
x \ | \
\
| \
\
(x, y) \ | \
| \
-2 \ | \
\
| \
\
| \
| \
-1 \ | \
\
| \
\
| \
| \
0 \ | \
\
| \
\
| \
| \
1 \ | \
\
| \
\
| \
| \
2 \ | \
\
| \
\
| \
| 3 | \ \
| \
\
| \